Most people brush their teeth the wrong way, periodontal disease symptoms can be manifested as bad taste in the mouth, swollen gums, bleeding, brittle texture, gum recession, easy to embedded food, pus overflowing from the gums, exposed tooth roots, sensitivity to hot and cold, loose and shifting of the teeth (or implants), and so on. People can prevent or even control periodontal disease through relatively simple means: daily scientific brushing and flossing, proper use of mouthwash and tongue scraper, and regular checkups with a periodontist for treatment and maintenance. Often their own oral health care is very important. At present, many people attach great importance to the choice of toothpaste, mouthwash, in fact, for the teeth, the order of importance should be: brushing method is the first, toothbrush is the second, toothpaste ranked third. “Left and right brush”, “up and down brush” and other most people take for granted the method of brushing, in fact, is wrong, horizontal brush or vertical brush can only clean the teeth outermost, can not effectively remove the gap between the teeth, teeth fossa. The softer the bristles of the toothbrush, the less clean the correct way of brushing should be “rotating brush”, the tip of the toothbrush gently pressed against the top of the gums, force moderate rotation of the toothbrush, the use of the elasticity of the brush bristles and the surface of the teeth in full contact with the rhythm, by the friction of the brush bristles and the surface of the teeth to remove plaque bacteria. The inner incisors are curved, so gently rotate the toothbrush about 30 degrees and lift it up and down in order to really brush them into place. Repeat each action more than 5 times, and each brushing takes 3 minutes. Instead of choosing a toothbrush with hard or soft bristles, choose fine bristles. Some people will go for soft bristles deliberately because they mistakenly believe that soft bristles don’t hurt their teeth. But the softness of the bristles and the cleaning efficiency are not what we usually think. The softer the brush, the less clean it is, but the harder it is, the more it wears down the surface of the teeth and damages the gums. In addition, brushing your teeth once in the morning and once in the evening is enough, and brushing at night is even more important. The reproduction cycle of plaque bacteria peaks at night. Brushing at night removes plaque bacteria that have the ability to reproduce. In addition, do not brush your teeth after eating sugar, just rinse your mouth, brushing instead destroys the protective effect of tooth enamel.