Reduction in cariogenic bacteria, either chemically or mechanically, to reduce and prevent future carious lesions can be accomplished by _____________.

• A. reinforcing OHI
• B. using antibiotics
• C. sealants
• D. brushing only

Answer: (A)

Controlling plaque biofilm through patient education is the way to lower the number of cariogenic bacteria both by mechanical removal and by using chemical aids as part of routine oral hygiene. Reinforcing oral hygiene instructions teaches patients how to brush and floss effectively, how often to clean, and how to reduce fermentable sugars in the diet, all of which decrease plaque accumulation and acid production. When done consistently, this approach reduces the bacterial load in the mouth and lowers future caries risk.

Other options don’t fit as well. Antibiotics aren’t used routinely for caries prevention and can lead to resistance and side effects. Sealants protect specific tooth surfaces but don’t reduce bacteria in the overall plaque biofilm. Brushing alone omits interdental cleaning and dietary guidance that are important for comprehensive plaque control.