Reducing how often sugary snacks are eaten is the most impactful focus in a brief counseling session aimed at lowering caries risk. Cariogenic bacteria in the mouth feed on fermentable sugars and produce acids that demineralize tooth enamel; each time sugary foods are consumed, another acid attack occurs. In a short visit, stopping or greatly reducing the frequency of sugar intake cuts the number of acid challenges, giving saliva more time to neutralize acid and minerals a chance to remineralize enamel. The other options don’t directly influence caries risk in the same immediate way. Increasing physical activity to lose weight targets body weight, not the oral environment where caries develop. A multivitamin doesn’t address the specific dietary sugars or acid attacks that drive caries. Avoiding vegetables is not protective and would likely reduce overall nutrient intake. Focusing on lowering sugary snack frequency directly disrupts the cycle of demineralization and supports better oral health in a brief counseling session.