The best time to clean teeth: Time! Parents should clean the teeth of infants and toddlers with finger cots as soon as the first tooth comes in, until all the teeth have come in, switch to brushing with a child’s toothbrush, and teach the child the correct way to brush when he or she is able to brush on his or her own. After everyone has eaten, use a blossom to completely remove any food residue in the mouth within 20 minutes before it has fermented with bacteria. Choose brushing tools, brushing aids, brushing products and brushing methods carefully: brushing tools should be high-quality soft-bristled healthcare toothbrushes, and aids should be interdental brushes and dental floss. Brushing products should not only clean the teeth but also protect the gums, and can effectively kill plaque while maintaining the ecological balance of the oral cavity. Brush your teeth using the Bechdel method. Brush your teeth at least twice a day, and most importantly before going to bed. Daily oral self-examination is the most important, and if there is any abnormality, consult a doctor immediately. Regular dental checkups by a dentist twice a year is the most effective way to prevent caries and periodontal disease. Applying fluoride varnish or sealant to six-year-old teeth can prevent tooth decay. Effectively improve the function of the body’s immune system, the health of the human body is very important, usually to develop good dietary hygiene habits, more intake of balanced and nutritious food, participate in sports, physical health, so as to enhance the immunity of the human body system.