Oral hygiene and common oral diseases are closely related to the maintenance of good oral hygiene is oral preventive care and important content, and oral hygiene is focused on the removal of plaque, soft scale, dental food debris. (1) to develop good chewing habits, correct the partial side chewing, alternate chewing on both sides of the daily meal arrangement should not only consider adequate nutritional million points, and to own than with a certain hardness and the right amount of fiber food. (2) rinse: mouth with a certain amount of mouthwash, drumming both cheeks and lips, the use of water and teeth, gums, oral mucosa of full contact with the impact of water force, so that the residual food debris in the mouth and part of the tartar can be eliminated, to develop good habits after each meal should rinse the mouth. (3) brushing: is 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 pigments, but also massage the gums and promote blood circulation. 1, toothbrush: health care toothbrush head short and narrow, each bunch of toothbrushes are tightly gathered into a column and equal length, the distance between each other is large, toothbrush should be dried after use, brush head up into the mouthwash cup, and every three months should replace a toothbrush. 2, brushing method: vertical brushing method, toothbrush bristles placed on the alveolar mucosa at 45 degrees, and then rotate along the gums in a horizontal direction to move back and forth, each part repeated 8-10 times, brushing time should be once a day before going to bed and after getting up in the morning, 2-3 minutes each time. 3.Cleaning agent: Toothpaste is the most used, it is the auxiliary for brushing, it has the cleaning effect of removing plaque and tartar, which can reduce the occurrence and development of caries and gingivitis. 4.Interdental cleaning: It is difficult to eliminate the plaque on the neighboring surface between teeth by brushing, it can be used to remove the dirt on the neighboring surface by tensing the dental floss through the contact point of neighboring teeth into the gap and pulling it left and right for pulling or action.