How long is the healthiest time to brush your teeth?

　　In addition to brushing your teeth in the morning and evening, it is best to brush your teeth once after each meal. If there is no condition, you should also rinse your mouth with water. Brushing your teeth at night is especially important. If you don't brush your teeth before going to bed at night, the food crumbs and residue left after eating during the day will accumulate in the gaps and fissures between the teeth, becoming a breeding ground for bacterial growth and reproduction.

　　In addition, due to the cessation of oral chewing and speech activities at night, saliva secretion is also greatly reduced, resulting in the weakening of the oral self-cleaning function, which is more conducive to the proliferation of bacteria, and the acid produced by fermentation will also corrode teeth. “Professor Chen Shizhang said.

　　Brushing your teeth is by no means a routine activity, and many people don’t want to take the extra time to do so. The survey shows that 60.4% of people brush their teeth for 1-2 minutes, 23.8% spend less than 1 minute, and 15.8% spend more than two minutes, which means that more than 80% of people brush their teeth for not enough time. If you don’t brush your teeth long enough, it will be wasted. Experts say that in addition to the massage and cleaning effect, toothpaste also has sterilization and other health care functions. If toothpaste does not have sufficient contact with teeth and the contact time is too short, it will not be able to fully exert its functions. It is best to brush your teeth for about 3 minutes each time, so that the teeth are in a higher concentration of fluorine environment and improve their surface's ability to resist decalcification and caries.

　　If you know how to brush your teeth, you must also have a good toothbrush. Professor Chen Shizhang said that after brushing your teeth, you should rinse the toothbrush with clean water several times, dry the bristles, and place the brush head upward in a ventilated place. Toothbrush bristles should be replaced if they are deformed or used for about three months.

　　The survey shows that 44.3% of people change their toothbrushes in about three months, but 20.4% of people change their toothbrushes in three months to half a year, and 9.6% of people change their toothbrushes more than half a year. In addition to changing toothbrushes regularly, people should also change toothpaste regularly. Otherwise, due to the single ingredient of toothpaste, it will lead to an imbalance of oral flora and the emergence of oral drug-resistant bacteria.