TheoryNEBDN Dental Nurse
Practice Test
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NEBDN Dental Nurse exam — full Q&A walkthrough
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30 free NEBDN Dental Nurse questions
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NEBDN Dental Nurse
Referring to the image provided, which structure forms the outermost protective layer of the tooth crown?
Correct — C. Enamel is the highly mineralised surface of the crown, providing resistance against mechanical and chemical damage. Why the other options are incorrect: • Dentine: Dentine lies beneath enamel and is not the outermost surface. • Pulp chamber: The pulp chamber is a deep internal compartment. • Cementum: Cementum coats the root, not the crown. • Periodontal ligament: The periodontal ligament suspends the tooth within its bony socket. -
NEBDN Dental Nurse
A patient presents with redness and swelling of the tissue that closely encircles the teeth inside the mouth. Which structure is most likely inflamed?
Correct — B. The gingiva, commonly called the gums, directly surrounds the teeth and is the tissue most frequently affected by inflammatory conditions such as gingivitis. Why the other options are incorrect: • Hard palate: The hard palate constitutes the bony front section of the roof of the mouth and does not encircle the teeth. • Tongue: The tongue is a muscular organ involved in taste and speech, and it does not surround the teeth. • Buccal mucosa: The buccal mucosa covers the inner surface of the cheeks rather than encircling the teeth. • Soft palate: The soft palate lies at the rear of the oral cavity roof and plays no role in surrounding the teeth. -
NEBDN Dental Nurse
A dental nurse is asked to polish the cheek-facing surfaces of the upper molar teeth. Which surfaces does this instruction refer to?
Correct — C. Buccal surfaces are those that face the cheeks on posterior teeth. Why the other options are incorrect: • Lingual surfaces: Lingual surfaces are directed toward the tongue rather than the cheeks. • Palatal surfaces: Palatal surfaces are specific to upper teeth and face the hard palate, not the cheeks. • Mesial surfaces: Mesial surfaces face toward the midline of the dental arch. • Distal surfaces: Distal surfaces face away from the midline of the dental arch. -
NEBDN Dental Nurse
Which of the following most accurately describes the mesial surface of a tooth?
Correct — C. The mesial surface is the side of a tooth that faces toward the midline of the dental arch. Why the other options are incorrect: • The surface oriented toward the cheek: The surface facing the cheek is called the buccal surface. • The surface oriented toward the tongue: The surface facing the tongue is called the lingual surface. • The surface farthest from the dental midline: The surface farthest from the midline is called the distal surface. • The biting or chewing surface: The biting or chewing surface is called the occlusal surface. -
NEBDN Dental Nurse
When charting the upper right first molar using the FDI two-digit system, which number should the dental nurse record?
Correct — A. Under the FDI system, quadrant 1 denotes the upper right, and the first molar occupies position 6, making this tooth number 16. Why the other options are incorrect: • 26: 26 identifies the first molar in the upper left quadrant (quadrant 2). • 36: 36 identifies the first molar in the lower left quadrant (quadrant 3). • 46: 46 identifies the first molar in the lower right quadrant (quadrant 4). • 15: 15 designates the second premolar in the upper right quadrant. -
NEBDN Dental Nurse
Looking at the image provided, which structure houses the tooth's blood vessels and nerve supply?
Correct — C. The pulp chamber is the hollow core of the tooth containing nerves and blood vessels that maintain tooth vitality. Why the other options are incorrect: • Enamel: Enamel is a non-vital, avascular mineralised tissue. • Dentine: Dentine can transmit stimuli through tubules but does not house the main nerve and blood supply. • Cementum: Cementum is a thin calcified covering on the root surface. • Gingiva: The gingiva is the soft mucosal tissue encircling the tooth at the gum line. -
NEBDN Dental Nurse
Gum recession has left part of a patient's root exposed. Which tissue normally coats the root surface?
Correct — C. Cementum is the calcified layer covering the root and provides attachment sites for the periodontal ligament. Why the other options are incorrect: • Enamel: Enamel is confined to the crown and does not extend onto the root. • Dentine: Dentine underlies both enamel and cementum and is not a surface covering. • Pulp: The pulp is enclosed within the tooth and does not cover the root. • Alveolar bone: Alveolar bone surrounds the root within the socket but does not coat its surface. -
NEBDN Dental Nurse
A dental nurse encounters the notation 'tooth 75' on a chart and is uncertain whether it refers to a primary or a permanent tooth. What is the most appropriate course of action?
Correct — B. FDI quadrants 5 through 8 are assigned to the primary dentition, so verifying the numbering system in use is essential for correct tooth identification. Why the other options are incorrect: • Assume the tooth belongs to the permanent dentition: Defaulting to permanent dentition without verification could result in treating the wrong tooth. • Document it as a lower right permanent molar: Tooth 75 belongs to the primary dentition, making it incorrect to record it as a permanent molar. • Disregard the number and continue with treatment: Proceeding while ignoring the numbering introduces a significant risk of clinical error. • Convert the notation to the universal numbering system: Changing to a different numbering system without agreement from the treating clinician is inappropriate. -
NEBDN Dental Nurse
Looking at the diagram, which tissue is found immediately below the enamel layer?
Correct — B. Dentine makes up the majority of the tooth structure and is positioned immediately beneath the enamel. Why the other options are incorrect: • Pulp chamber: The pulp chamber is located deeper within the tooth, not immediately beneath the enamel. • Cementum: Cementum covers the root surface and is not found beneath the enamel. • Gingival tissue: The gingiva is external soft tissue surrounding the tooth, not a layer beneath enamel. • Alveolar bone: Bone supports the tooth socket but is not situated beneath the enamel layer. -
NEBDN Dental Nurse
During an oral examination, the clinician describes a structure forming the front part of the roof of the mouth that is bony in nature. Which structure is being described?
Correct — B. The hard palate is the bony, anterior portion of the oral roof and is the structure that fits this description. Why the other options are incorrect: • Soft palate: The soft palate is situated posteriorly and is composed of muscle rather than bone. • Uvula: The uvula is a small soft-tissue projection suspended from the posterior margin of the soft palate. • Tongue: The tongue is a muscular organ resting on the floor of the mouth, not part of the roof. • Floor of mouth: The floor of the mouth is an inferior structure and does not form any part of the roof. -
NEBDN Dental Nurse
A dentist states that tooth 14 requires treatment. What should the dental nurse do to prepare?
Correct — A. FDI tooth 14 belongs to quadrant 1 (upper right) and is at position 4, which is the first premolar. Why the other options are incorrect: • Set up for treatment of the upper left first premolar: The upper left first premolar is numbered 24, not 14. • Set up for treatment of the lower right first premolar: The lower right first premolar is numbered 44. • Set up for treatment of the upper right second premolar: The upper right second premolar is numbered 15. • Set up for treatment of the lower left first premolar: The lower left first premolar is numbered 34. -
NEBDN Dental Nurse
A patient requires root canal therapy because of a tooth infection. Which tooth structure is removed during this treatment?
Correct — C. During root canal therapy, the infected pulp tissue is removed from within the tooth. Why the other options are incorrect: • Enamel: Enamel is preserved and not targeted during root canal treatment. • Dentine: Dentine is kept intact as much as possible throughout the procedure. • Cementum: Cementum on the root surface is not removed during this treatment. • Gingiva: The gingival tissue is not involved in root canal therapy. -
NEBDN Dental Nurse
Based on the image, which structure encircles the root and connects it to the surrounding bone?
Correct — C. The periodontal ligament runs between the root surface and the alveolar bone, securing the tooth within its socket. Why the other options are incorrect: • Gingiva: The gingiva encircles the tooth at the gum line but does not link the root to bone. • Enamel: Enamel is restricted to the surface of the crown. • Dentine: Dentine is an internal tooth layer and does not form any bony attachment. • Pulp: The pulp is the central soft tissue of the tooth. -
NEBDN Dental Nurse
A dental nurse reviews a radiograph showing breakdown of tooth-supporting structures. Which tissue is chiefly responsible for anchoring the tooth within its socket?
Correct — C. The periodontal ligament connects the root to the alveolar bone, providing anchorage and distributing biting forces. Why the other options are incorrect: • Enamel: Enamel is a protective outer coating and plays no role in tooth attachment. • Pulp chamber: The pulp chamber is the neurovascular core of the tooth. • Dentine: Dentine contributes to the tooth's bulk but does not secure it within the socket. • Gingiva: The gingiva covers and protects surrounding tissue but does not anchor the tooth to bone. -
NEBDN Dental Nurse
Which sequence correctly lists the layers of the tooth crown from the outermost surface to the centre?
Correct — B. The correct order moving from surface to centre is enamel on the outside, dentine in the middle, and pulp at the core. Why the other options are incorrect: • Dentine → Enamel → Pulp: Dentine is the middle layer, not the outermost. • Pulp → Dentine → Enamel: Pulp is the innermost structure, not the outermost. • Enamel → Pulp → Dentine: Pulp lies at the centre and is not positioned between enamel and dentine. • Cementum → Enamel → Pulp: Cementum covers the root and does not form part of the crown layer sequence. -
NEBDN Dental Nurse
Following enamel erosion, a patient reports severe cold sensitivity. Which underlying structure is most likely responsible for conducting this sensation?
Correct — B. Dentine houses microscopic tubules that carry stimuli to the pulp; when these tubules are unprotected, the patient experiences sensitivity. Why the other options are incorrect: • Enamel: Enamel is an inert, acellular tissue incapable of transmitting sensation. • Cementum: Cementum is a root-surface covering and plays no significant part in sensory transmission. • Alveolar bone: Alveolar bone forms the tooth socket but does not conduct sensory signals from the tooth. • Gingiva: The gingiva shields surrounding structures but does not transmit tooth sensation. -
NEBDN Dental Nurse
A dental nurse records a lower right canine as tooth 43 in the FDI system. What is the accurate FDI designation for this tooth?
Correct — E. Tooth 43 is indeed the correct FDI number for the lower right canine, so the recording contains no error. Why the other options are incorrect: • 33: 33 denotes the lower left canine, not the lower right. • 13: 13 denotes the upper right canine. • 23: 23 denotes the upper left canine. • 44: 44 refers to the first premolar in the lower right quadrant. -
NEBDN Dental Nurse
On a maxillary incisor, which surface is directed toward the roof of the mouth?
Correct — B. The lingual surface of upper incisors faces the palate, which forms the roof of the mouth. Why the other options are incorrect: • Labial surface: The labial surface faces the lips, not the palate. • Buccal surface: Buccal surface is a term applied to posterior teeth facing the cheeks. • Occlusal surface: Incisors do not have an occlusal surface; they have an incisal edge instead. • Mesial surface: The mesial surface faces toward the midline of the arch, not the palate. -
NEBDN Dental Nurse
Based on the tooth image provided, which surface is most susceptible to plaque accumulation due to its pits and fissures?
Correct — C. The occlusal surface contains pits and fissures that create ideal conditions for plaque to accumulate. Why the other options are incorrect: • Buccal surface: The buccal surface is relatively smooth and less prone to fissure-related plaque retention. • Lingual surface: The lingual surface generally lacks the deep pits and fissures characteristic of the occlusal surface. • Mesial surface: The mesial surface is a contact area between adjacent teeth, not a fissured chewing surface. • Distal surface: The distal surface is also a contact area and does not contain pits and fissures. -
NEBDN Dental Nurse
Radiographs of a patient with periodontal disease reveal significant bone loss around multiple teeth. Which structure is primarily being destroyed?
Correct — B. Alveolar bone forms the bony socket housing the tooth roots and is the principal structure lost in progressive periodontal disease. Why the other options are incorrect: • Gingiva: The gingiva is soft tissue that, while affected, is not the primary structural support being lost. • Enamel: Enamel is a crown surface layer and has no connection to bone support. • Dentine: Dentine makes up the body of the tooth and is unrelated to bone support. • Pulp: The pulp is the internal neurovascular tissue and plays no role in bone support. -
NEBDN Dental Nurse
A patient reports persistent toothache and visible swelling. Clinical findings indicate inflammation inside the core of the tooth. Which structure is involved?
Correct — C. The pulp chamber contains the tooth's nerve and blood supply; it is the site of inflammation when pulpitis develops. Why the other options are incorrect: • Enamel: Enamel has no nerve supply or blood vessels. • Dentine: Dentine conducts stimuli toward the pulp but is not where inflammation originates. • Cementum: Cementum coats the root surface and is unrelated to pulp inflammation. • Periodontal ligament: The periodontal ligament anchors the tooth in bone but is not the core tissue affected here. -
NEBDN Dental Nurse
A dental chart labels the chewing surface of a premolar as the 'incisal surface.' What is the mistake in this notation?
Correct — B. Premolars have an occlusal surface used for chewing; the incisal surface is a term that applies only to anterior teeth such as incisors and canines. Why the other options are incorrect: • Incisal is a term reserved for posterior teeth: This is itself incorrect — incisal is a term for anterior teeth, not posterior ones. • Mesial was confused with distal: Confusing mesial and distal is an unrelated error and not what occurred here. • The lingual surface was omitted: Omitting the lingual surface is a separate issue and not the error being described. • The buccal surface was given the wrong label: Mislabelling the buccal surface is unrelated to incorrectly naming the chewing surface. -
NEBDN Dental Nurse
A dental nurse identifies a charting error stating that enamel contains living cells. Which of the following correctly describes enamel?
Correct — C. Enamel is a non-vital, acellular tissue; once fully formed it contains no living cells. Why the other options are incorrect: • Enamel has a blood supply: Enamel is avascular and has no blood supply. • Enamel contains nerve fibres: Enamel contains no nerve fibres. • Enamel has a collagen matrix: Enamel does not have a collagen component. • Enamel is capable of self-repair: Enamel cannot regenerate or self-repair. -
NEBDN Dental Nurse
A dental chart states that the submandibular gland's duct opens opposite the upper molar teeth. What is the nature of this error?
Correct — A. The submandibular duct opens beneath the tongue onto the floor of the mouth; the opening opposite the upper molars belongs to the parotid duct, so the wrong gland has been attributed to that location. Why the other options are incorrect: • Confusion between minor and major glands: The error is specifically about duct location, not about distinguishing minor from major glands. • Incorrect identification of the tongue structure: No tongue structure has been incorrectly identified; the mistake concerns duct openings. • Confusion between labial and buccal glands: Labial and buccal glands are unrelated to the duct opening described. • Mislabeling of gingiva: The gingiva is not implicated in this error. -
NEBDN Dental Nurse
Describe the correct pathway that saliva takes from the submandibular gland into the oral cavity.
Correct — B. Saliva secreted by the submandibular gland travels through Wharton's duct before emptying into the oral cavity. Why the other options are incorrect: • Gland → Stensen's duct → Oral cavity: Stensen's duct is the excretory duct of the parotid gland, not the submandibular gland. • Gland → Minor ducts → Oral cavity: Minor ducts are not the primary drainage pathway for the submandibular gland. • Gland → Parotid duct → Oral cavity: The parotid duct drains the parotid gland and has no connection to the submandibular gland. • Gland → Palatal duct → Oral cavity: There is no palatal duct associated with the submandibular gland. -
NEBDN Dental Nurse
During a molar restoration, the dentist is treating the biting surface used for grinding food. A dental nurse needs to identify this surface. What is it called?
Correct — C. The occlusal surface is the functional biting and grinding surface found on posterior teeth such as molars and premolars. Why the other options are incorrect: • Buccal surface: The buccal surface faces the inner cheek and is not the top biting surface. • Lingual surface: The lingual surface faces the tongue and is not the chewing surface. • Mesial surface: The mesial surface is the side of the tooth closest to the dental midline, not the biting surface. • Incisal surface: Incisal surfaces belong to anterior teeth such as incisors and canines, not to molars. -
NEBDN Dental Nurse
During a clinical examination, a dentist notices areas of wear on the grinding surfaces of the back teeth. Which anatomical term correctly identifies these surfaces?
Correct — C. The occlusal surfaces are the grinding surfaces of posterior teeth and are the most common sites where wear facets develop. Why the other options are incorrect: • Buccal surfaces: Buccal surfaces are oriented toward the cheeks. • Lingual surfaces: Lingual surfaces are directed toward the tongue. • Mesial surfaces: Mesial surfaces face toward the midline of the dental arch. • Distal surfaces: Distal surfaces face away from the midline of the arch. -
NEBDN Dental Nurse
A patient reports a noticeable swelling in front of the ear that worsens at mealtimes. Which salivary gland is most likely responsible?
Correct — C. The parotid gland sits anterior to the ear and typically enlarges in response to salivary stimulation, such as when eating. Why the other options are incorrect: • Submandibular gland: The submandibular gland is situated below the lower jaw, not near the ear. • Sublingual gland: The sublingual gland lies beneath the tongue, away from the ear region. • Minor salivary glands: Minor salivary glands are diffusely distributed and do not produce a distinct localised swelling near the ear. • Labial glands: Labial glands are small glands within the lips and are not located in the pre-auricular area. -
NEBDN Dental Nurse
A dental chart describes the posterior, non-bony section of the palate as the hard palate. What type of error does this represent?
Correct — A. The soft palate is composed of muscle, while the hard palate is bony; labelling the muscular soft palate as the hard palate is therefore an anatomical misidentification of tissue type. Why the other options are incorrect: • Confusion between the tongue and the palate: The tongue is an entirely distinct structure from the palate and is not relevant to this charting error. • An error in quadrant identification: Quadrant identification applies to the classification of teeth, not to palate structures, so this is unrelated. • Mislabelling of the gingiva: The gingiva surrounds the teeth and has no connection to this particular error. • Confusion between buccal mucosa and labial mucosa: The buccal and labial mucosae line the cheeks and lips respectively and are not implicated in this mistake. -
NEBDN Dental Nurse
The dentist refers to tooth 31 during an examination. Which tooth is being indicated?
Correct — A. In the FDI system, quadrant 3 covers the lower left, and position 1 is the central incisor, so tooth 31 is the lower left central incisor. Why the other options are incorrect: • Lower right central incisor: The lower right central incisor carries the FDI number 41. • Upper left central incisor: The upper left central incisor is numbered 21. • Upper right central incisor: The upper right central incisor is numbered 11. • Lower left lateral incisor: The lower left lateral incisor is numbered 32, not 31.
NEBDN Dental Nurse sample questions
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NEBDN Dental Nurse A dental nurse identifies a charting error stating that enamel contains living cells. Which of the following correctly describes enamel?
A. Enamel has a blood supply
B. Enamel contains nerve fibres
C. Enamel is a non-living tissue ✓
D. Enamel has a collagen matrix
E. Enamel is capable of self-repair
Correct — C. Enamel is a non-vital, acellular tissue; once fully formed it contains no living cells. Why the other options are incorrect: • Enamel has a blood supply: Enamel is avascular and has no blood supply. • Enamel contains nerve fibres: Enamel contains no nerve fibres. • Enamel has a collagen matrix: Enamel does not have a collagen component. • Enamel is capable of self-repair: Enamel cannot regenerate or self-repair.
NEBDN Dental Nurse A dental chart states that the submandibular gland's duct opens opposite the upper molar teeth. What is the nature of this error?
A. Incorrect gland identified for that duct location ✓
B. Confusion between minor and major glands
C. Incorrect identification of the tongue structure
D. Confusion between labial and buccal glands
E. Mislabeling of gingiva
Correct — A. The submandibular duct opens beneath the tongue onto the floor of the mouth; the opening opposite the upper molars belongs to the parotid duct, so the wrong gland has been attributed to that location. Why the other options are incorrect: • Confusion between minor and major glands: The error is specifically about duct location, not about distinguishing minor from major glands. • Incorrect identification of the tongue structure: No tongue structure has been incorrectly identified; the mistake concerns duct openings. • Confusion between labial and buccal glands: Labial and buccal glands are unrelated to the duct opening described. • Mislabeling of gingiva: The gingiva is not implicated in this error.
NEBDN Dental Nurse Describe the correct pathway that saliva takes from the submandibular gland into the oral cavity.
A. Gland → Stensen's duct → Oral cavity
B. Gland → Wharton's duct → Oral cavity ✓
C. Gland → Minor ducts → Oral cavity
D. Gland → Parotid duct → Oral cavity
E. Gland → Palatal duct → Oral cavity
Correct — B. Saliva secreted by the submandibular gland travels through Wharton's duct before emptying into the oral cavity. Why the other options are incorrect: • Gland → Stensen's duct → Oral cavity: Stensen's duct is the excretory duct of the parotid gland, not the submandibular gland. • Gland → Minor ducts → Oral cavity: Minor ducts are not the primary drainage pathway for the submandibular gland. • Gland → Parotid duct → Oral cavity: The parotid duct drains the parotid gland and has no connection to the submandibular gland. • Gland → Palatal duct → Oral cavity: There is no palatal duct associated with the submandibular gland.
NEBDN Dental Nurse During a molar restoration, the dentist is treating the biting surface used for grinding food. A dental nurse needs to identify this surface. What is it called?
A. Buccal surface
B. Lingual surface
C. Occlusal surface ✓
D. Mesial surface
E. Incisal surface
Correct — C. The occlusal surface is the functional biting and grinding surface found on posterior teeth such as molars and premolars. Why the other options are incorrect: • Buccal surface: The buccal surface faces the inner cheek and is not the top biting surface. • Lingual surface: The lingual surface faces the tongue and is not the chewing surface. • Mesial surface: The mesial surface is the side of the tooth closest to the dental midline, not the biting surface. • Incisal surface: Incisal surfaces belong to anterior teeth such as incisors and canines, not to molars.
NEBDN Dental Nurse During a clinical examination, a dentist notices areas of wear on the grinding surfaces of the back teeth. Which anatomical term correctly identifies these surfaces?
A. Buccal surfaces
B. Lingual surfaces
C. Occlusal surfaces ✓
D. Mesial surfaces
E. Distal surfaces
Correct — C. The occlusal surfaces are the grinding surfaces of posterior teeth and are the most common sites where wear facets develop. Why the other options are incorrect: • Buccal surfaces: Buccal surfaces are oriented toward the cheeks. • Lingual surfaces: Lingual surfaces are directed toward the tongue. • Mesial surfaces: Mesial surfaces face toward the midline of the dental arch. • Distal surfaces: Distal surfaces face away from the midline of the arch.
NEBDN Dental Nurse A patient reports a noticeable swelling in front of the ear that worsens at mealtimes. Which salivary gland is most likely responsible?
A. Submandibular gland
B. Sublingual gland
C. Parotid gland ✓
D. Minor salivary glands
E. Labial glands
Correct — C. The parotid gland sits anterior to the ear and typically enlarges in response to salivary stimulation, such as when eating. Why the other options are incorrect: • Submandibular gland: The submandibular gland is situated below the lower jaw, not near the ear. • Sublingual gland: The sublingual gland lies beneath the tongue, away from the ear region. • Minor salivary glands: Minor salivary glands are diffusely distributed and do not produce a distinct localised swelling near the ear. • Labial glands: Labial glands are small glands within the lips and are not located in the pre-auricular area.
NEBDN Dental Nurse A dental chart describes the posterior, non-bony section of the palate as the hard palate. What type of error does this represent?
A. Misidentification of a muscular structure as a bony one ✓
B. Confusion between the tongue and the palate
C. An error in quadrant identification
D. Mislabelling of the gingiva
E. Confusion between buccal mucosa and labial mucosa
Correct — A. The soft palate is composed of muscle, while the hard palate is bony; labelling the muscular soft palate as the hard palate is therefore an anatomical misidentification of tissue type. Why the other options are incorrect: • Confusion between the tongue and the palate: The tongue is an entirely distinct structure from the palate and is not relevant to this charting error. • An error in quadrant identification: Quadrant identification applies to the classification of teeth, not to palate structures, so this is unrelated. • Mislabelling of the gingiva: The gingiva surrounds the teeth and has no connection to this particular error. • Confusion between buccal mucosa and labial mucosa: The buccal and labial mucosae line the cheeks and lips respectively and are not implicated in this mistake.
NEBDN Dental Nurse The dentist refers to tooth 31 during an examination. Which tooth is being indicated?
A. Lower left central incisor ✓
B. Lower right central incisor
C. Upper left central incisor
D. Upper right central incisor
E. Lower left lateral incisor
Correct — A. In the FDI system, quadrant 3 covers the lower left, and position 1 is the central incisor, so tooth 31 is the lower left central incisor. Why the other options are incorrect: • Lower right central incisor: The lower right central incisor carries the FDI number 41. • Upper left central incisor: The upper left central incisor is numbered 21. • Upper right central incisor: The upper right central incisor is numbered 11. • Lower left lateral incisor: The lower left lateral incisor is numbered 32, not 31.
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Safe and effective care environment
Health promotion and maintenance
Psychosocial and physiological integrity
Pharmacology, infection control and patient safety
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