Maintain oral hygiene, scientific dental care, brushing and rinsing for the prevention of periodontitis is very important to reduce the incidence of periodontitis, so we should pay attention to: 1, develop good chewing habits, correct the bias side of the chewing, chewing on both sides of the alternating chewing of the daily dietary arrangements not only to consider adequate nutritional million points, but also a certain degree of hardness and the right amount of fiber food. 2, gargle: each time after eating a certain amount of mouthwash, drumming cheeks and lips, using water and teeth, gums, oral mucosa full contact with the impact of the water force, so that the residual food debris in the mouth and some tartar can be eliminated. 3, brushing: the most effective way to maintain oral hygiene, a good toothbrush and the correct method of brushing can brush away plaque, soft scale, food debris and some pigment, but also massage the gums, promote blood circulation. (1) Toothbrush: health care toothbrush head is short and narrow, each bunch of toothbrushes are tightly gathered into a column and the length is equal, the distance between each other is large, toothbrush should be used to shake off the water on the bristles, the brush head upward into the mouthwash cup, and every three months should be replaced by a toothbrush. (2) Brushing method: vertical brush method, the toothbrush bristles on the alveolar mucosa at 45 degrees, and then along the gums to the side of the rotation to the horizontal direction of the back and forth movement, each part of the repetition of 8-10 times, brushing time should be once a day before bedtime and after getting up in the morning, each time for 2-3 minutes. (3) dental cleaning agent to toothpaste is the most used, is the auxiliary supplies for brushing, with friction to remove plaque, tartar calculus cleaning effect, can reduce caries, gingivitis, the occurrence and development. 4, interdental cleaning: brushing is difficult to eliminate plaque on the neighboring surfaces between the teeth, can be used to taut floss through the neighboring teeth contact points into the gap, the left and right pulling for the removal of neighboring surfaces of the saw or action of the dirt.