In life, many families share one toothpaste, unaware that many oral diseases can be cross-contaminated. Moreover, each person should choose a different toothpaste according to different oral conditions. Share the same toothpaste, if one of them has a cold, or oral disease, in the process of brushing, cold virus, oral bacteria is easy to remain in the toothbrush bristles, in the toothpaste mouth and toothbrush friction, and will spread the virus, bacteria to other people’s toothbrush. At the same time, the large tube of toothpaste used for a longer period of time, exposure to the air will naturally increase, the toothbrush in repeated use, the chance of exposure to bacteria is also greatly increased. Therefore, it is best for each person to have their own toothpaste and to choose the small tube to reduce the chances of bacteria transmission. In addition, because each person’s oral condition is different, the choice of toothpaste should also be targeted. In addition to the special toothpaste for children, people with different dental conditions should also use different toothpaste, for example, people with periodontitis or gingivitis can choose some herbal toothpaste or toothpaste with anti-inflammatory ingredients. If you have tooth decay, you can buy some fluoride toothpaste to avoid tooth corrosion and cavity formation on the tooth surface. If there are mouth ulcers, blackened teeth, toothache and bad breath, you should go to the hospital as soon as possible. Toothpaste should change the brand frequently. Using the same kind of toothpaste for a long time may make some harmful oral germs develop resistance and drug resistance, thus making the toothpaste useless. Changing the type of toothpaste frequently can maintain the normal oral flora and benefit dental health.