Oral Hygiene Instruction and Counselling Practice Questions
20 free Oral Hygiene Instruction and Counselling practice questions for the CDA. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
What is the primary goal of oral hygiene instruction for patients?
- A To encourage more frequent dental visits
- B To help patients effectively remove plaque and prevent disease
- C To teach patients how to whiten their teeth at home
- D To reduce the need for restorative procedures
Correct answer: To help patients effectively remove plaque and prevent disease
Oral hygiene instruction focuses on guiding patients to control plaque at home. Effective plaque removal reduces caries and periodontal disease.
Which brushing technique is most commonly recommended for adults with healthy gums?
- A Horizontal scrub technique
- B Charter’s technique
- C Bass or modified Bass technique
- D Stillman’s technique
Correct answer: Bass or modified Bass technique
The Bass technique targets the gingival margin, where plaque accumulates most. It is widely recommended for effective cleaning.
How often should patients brush their teeth for optimal oral health?
- A Once every two days
- B Once daily only
- C Twice daily
- D After every sip of water
Correct answer: Twice daily
Brushing twice daily helps effectively remove plaque and maintain healthy gums. More frequent brushing may not provide additional benefits.
What is the main purpose of dental floss?
- A To polish enamel
- B To remove interproximal plaque
- C To whiten teeth
- D To reduce saliva flow
Correct answer: To remove interproximal plaque
Floss removes plaque and debris between teeth where brushes cannot reach. This prevents interproximal caries and gingivitis.
Which device is most helpful for patients with orthodontic appliances?
- A Standard toothpick
- B Power toothbrush
- C Interdental brush
- D Tongue scraper
Correct answer: Interdental brush
Interdental brushes effectively clean around brackets and wires. They help prevent plaque accumulation and gingival inflammation.
Which recommendation is appropriate for patients with limited manual dexterity?
- A Hard-bristled toothbrush
- B Power toothbrush
- C Daily water-only rinsing
- D Shorter brushing time
Correct answer: Power toothbrush
Power toothbrushes simplify brushing motions and improve plaque removal. They are ideal for patients with limited hand mobility.
Why should toothbrushes be replaced every 3–4 months?
- A Worn bristles clean less effectively
- B To ensure bristles remain very stiff
- C Because toothpaste damages the bristles
- D To prevent tooth whitening
Correct answer: Worn bristles clean less effectively
Frayed bristles reduce plaque removal and may irritate gums. Regular replacement keeps the brush effective.
Which patient benefit results from using a tongue scraper?
- A Increases enamel thickness
- B Reduces halitosis by removing bacteria
- C Strengthens jaw muscles
- D Prevents tooth erosion
Correct answer: Reduces halitosis by removing bacteria
Tongue scraping removes odor-causing bacteria. This improves breath and overall oral cleanliness.
Which mouthrinse is best for reducing gingival inflammation?
- A Chlorhexidine
- B Hydrogen peroxide
- C Whitening rinse
- D Alcohol-free fluoride rinse
Correct answer: Chlorhexidine
Chlorhexidine is antimicrobial and effective against gingivitis. It is often used short-term under professional supervision.
Which brushing advice should be given to patients with gingival recession?
- A Use a hard-bristle brush
- B Brush vigorously for better cleaning
- C Use a soft-bristle toothbrush
- D Brush only once per day
Correct answer: Use a soft-bristle toothbrush
Soft bristles reduce abrasion of exposed root surfaces. This helps prevent recession from worsening.
What is the ideal brushing duration recommended for most patients?
- A 20 seconds
- B 45 seconds
- C 2 minutes
- D 5 minutes
Correct answer: 2 minutes
Two minutes allows enough time to thoroughly clean all tooth surfaces. This is the standard recommendation.
Which oral hygiene aid is most appropriate for cleaning around dental implants?
- A Metal interdental brush
- B Hard-bristle toothbrush
- C Soft, nylon-coated interdental brush
- D Wooden toothpick
Correct answer: Soft, nylon-coated interdental brush
Nylon-coated interdental brushes prevent scratching the implant surface. They safely remove plaque.
Which patient instruction helps prevent toothbrush abrasion?
- A Brush harder for deeper cleaning
- B Use gentle pressure while brushing
- C Use a back-and-forth sawing motion
- D Brush only once per day
Correct answer: Use gentle pressure while brushing
Gentle brushing protects enamel and gingiva. Excessive force contributes to abrasion and recession.
Why is nighttime brushing especially important?
- A Saliva flow decreases during sleep
- B Teeth grow faster at night
- C Dental plaque disappears overnight
- D Fluoride cannot work during the day
Correct answer: Saliva flow decreases during sleep
Low saliva flow at night reduces natural buffering. Removing plaque before bed protects against caries and gingivitis.
Which factor is most important when selecting toothpaste for a patient?
- A Color of the printed outer packaging and box design
- B Personal flavor preference of the individual patient
- C Patient's caries and periodontal risk
- D Overall physical size of the toothpaste tube
Correct answer: Patient's caries and periodontal risk
Product selection should match the patient’s needs, such as fluoride for caries or desensitising agents for sensitivity.
How can dental professionals ensure oral hygiene instructions are effective?
- A Speak quickly to save time
- B Use demonstration and patient practice
- C Provide instructions only once
- D Give verbal instructions without visual aids
Correct answer: Use demonstration and patient practice
Demonstration with patient practice reinforces learning. Hands-on guidance improves technique retention.
Which brushing method is safest for young children?
- A Hard scrubbing motion
- B Bass technique
- C Circular Fones technique
- D Horizontal scrub
Correct answer: Circular Fones technique
The Fones technique is easy and safe for children. Its circular motion improves cleaning without requiring advanced coordination.
What should patients do after using fluoridated toothpaste?
- A Rinse immediately with plenty of tap water
- B Spit out but do not rinse
- C Brush again with plain water
- D Eat food right away
Correct answer: Spit out but do not rinse
Avoiding rinsing prolongs fluoride contact with enamel. This enhances its protective effect.
Which advice is appropriate for patients with halitosis?
- A Avoid tongue cleaning
- B Rely only on strong alcohol-based mouth rinses
- C Clean the tongue and stay hydrated
- D Brush only once per day
Correct answer: Clean the tongue and stay hydrated
Tongue cleaning removes odor-causing bacteria. Hydration supports healthy salivary flow.
Why is it important to tailor oral hygiene instruction to each patient?
- A All patients have identical oral conditions
- B Individual needs and risk levels vary
- C It simplifies appointment scheduling
- D It ensures all patients buy the same products
Correct answer: Individual needs and risk levels vary
Patients differ in risk factors, dexterity, and oral conditions. Customising instructions improves outcomes and compliance.