Dental Assisting MN Licensure Exam
2026 Questions and Answers
Chlorahexadine Stain - Correct answer-Found in Chewing Gum and Mouthrinses,
Yellowish to green brown in color
Endogenous Stains - Correct answer-Originate within the tooth through
developmental and systemic disturbances and CAN'T be removed
Exogenous Stains - Correct answer-Those that originate outside the tooth and are
caused by environmental agents
Extrinsic Stains - Correct answer-Are those stains that appear on the exterior of the
tooth and CAN be removed
Intrinsic Stains - Correct answer-Are caused by environmental source but CAN'T
be removed because the stain has become incorporated into the tooth structure
Black Stain - Correct answer-Thin Black line on the teeth near the gingival margin,
Frequently found in clean mouths. Extrinsic
Tobacco Stain - Correct answer-A very tenacious dark brown or black stain -
Extrinsic
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,Brown or yellow stain - Correct answer-Most commonly found on the buccal
surfaces of the maxillary molars and the lingual surfaces of the lower anterior
Incisors - Extrinsic
Dental plaque agents - Correct answer-Reddish brown stain on the interproximal
and cervical areas of the teeth. Caused by prescription mouth princes that contain
chlorhexidine - Extrinsic
Nasmyths membrane - Correct answer-Light green or brownish stain caused by
food stains in the residue of epithelium, on newly erupted teeth - Extrinsic
Natural rubber polishing cups - Correct answer-More resilient and do not stain the
teeth
Synthetic polishing cups - Correct answer-should be used for patients with latex
allergies
Zirconium Silicate - Correct answer-Good for Gold, Exposed dentin, tooth colored
restorations
Tin Oxide - Correct answer-Good on enamel and metallic restorations, mixed with
water, alcohol, glycerin
Flour of pumice - Correct answer-to Remove stains from enamel, High
abrasiveness
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, Chalk - Correct answer-Mild abrasive, used in some prophy pastes and for both
whitening
Prophy Brushes should not be used on ___________ ? - Correct answer-Dentin
When polishing: - Correct answer-1)Apply light pressure so the cup flares into
sulcus 1 - 2mm
2) Go from the Gingival 3rd to the occlusal 3rd
3) overlapping strokes
What grasp is used to operate the prophy angle? - Correct answer-Pen grasp
Periodontal dressings Types - Correct answer-Zinc oxide - Eugenol (come in
powder or liquid form
What instruments are used to remove periodontal dressings - Correct answer-
Spoon excavator sickle Explorer and Surgical hoe
How to remove a periodontal dressing? - Correct answer-Instrument is inserted
along the margin of the dressing and a lateral pressure is used to pry dressing away
from tissues
How long should topical anesthetics be left on the mucosa? - Correct answer-1 min
- Delmar
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
2026 Questions and Answers
Chlorahexadine Stain - Correct answer-Found in Chewing Gum and Mouthrinses,
Yellowish to green brown in color
Endogenous Stains - Correct answer-Originate within the tooth through
developmental and systemic disturbances and CAN'T be removed
Exogenous Stains - Correct answer-Those that originate outside the tooth and are
caused by environmental agents
Extrinsic Stains - Correct answer-Are those stains that appear on the exterior of the
tooth and CAN be removed
Intrinsic Stains - Correct answer-Are caused by environmental source but CAN'T
be removed because the stain has become incorporated into the tooth structure
Black Stain - Correct answer-Thin Black line on the teeth near the gingival margin,
Frequently found in clean mouths. Extrinsic
Tobacco Stain - Correct answer-A very tenacious dark brown or black stain -
Extrinsic
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,Brown or yellow stain - Correct answer-Most commonly found on the buccal
surfaces of the maxillary molars and the lingual surfaces of the lower anterior
Incisors - Extrinsic
Dental plaque agents - Correct answer-Reddish brown stain on the interproximal
and cervical areas of the teeth. Caused by prescription mouth princes that contain
chlorhexidine - Extrinsic
Nasmyths membrane - Correct answer-Light green or brownish stain caused by
food stains in the residue of epithelium, on newly erupted teeth - Extrinsic
Natural rubber polishing cups - Correct answer-More resilient and do not stain the
teeth
Synthetic polishing cups - Correct answer-should be used for patients with latex
allergies
Zirconium Silicate - Correct answer-Good for Gold, Exposed dentin, tooth colored
restorations
Tin Oxide - Correct answer-Good on enamel and metallic restorations, mixed with
water, alcohol, glycerin
Flour of pumice - Correct answer-to Remove stains from enamel, High
abrasiveness
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, Chalk - Correct answer-Mild abrasive, used in some prophy pastes and for both
whitening
Prophy Brushes should not be used on ___________ ? - Correct answer-Dentin
When polishing: - Correct answer-1)Apply light pressure so the cup flares into
sulcus 1 - 2mm
2) Go from the Gingival 3rd to the occlusal 3rd
3) overlapping strokes
What grasp is used to operate the prophy angle? - Correct answer-Pen grasp
Periodontal dressings Types - Correct answer-Zinc oxide - Eugenol (come in
powder or liquid form
What instruments are used to remove periodontal dressings - Correct answer-
Spoon excavator sickle Explorer and Surgical hoe
How to remove a periodontal dressing? - Correct answer-Instrument is inserted
along the margin of the dressing and a lateral pressure is used to pry dressing away
from tissues
How long should topical anesthetics be left on the mucosa? - Correct answer-1 min
- Delmar
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
