We advocate brushing your teeth in the morning and evening and rinsing your mouth after meals. It is most important to brush your teeth before going to bed, because after falling asleep, saliva secretion will be reduced, and saliva can wash away bacteria and inhibit bacterial reproduction. If you do not brush your teeth before going to bed or did not brush clean, food debris in the role of bacteria will soon be fermented acid, coupled with the lack of saliva due to sleep in the mouth, can not dilute and neutralize the acid produced by the bacteria, the teeth are very easy to be corroded, the long term may lead to dental caries. So brush your teeth before going to bed, to stay in the gap between the teeth and the food debris on the tooth surface brush clean, after brushing no longer eat anything, you can maintain oral health overnight. Some people brush their teeth like a saw, that is, horizontal brush. This brushing method is harmful, day long will be in the root of the tooth “saw” a deep groove, the medical term called “wedge-shaped defects. People with this wedge-shaped defects, the lesser of cold, hot, sour, sweet food will cause toothache, the more serious will cause pulpitis, so that you have a toothache fidgety. What is the correct way to brush your teeth? That is the “horizontal trembling method”, brushing teeth lips and cheeks (outside), the toothbrush head placed on the tooth surface, so that the toothbrush and teeth at an angle of 45 degrees, bristles pointing to the gums, gently trembling, after turning the head of the toothbrush. Brush the upper teeth from the top to the bottom, and the lower teeth from the bottom to the top, and repeat 8-10 times for each part. When brushing the palatal surface of the upper front teeth and the lingual surface of the lower front teeth (the inner surface of the teeth), the head of the toothbrush can be erected to brush. Finally, place the toothbrush on the occlusal surface of the teeth and brush back and forth in a horizontal direction.