“Brushing your teeth immediately after eating can keep your mouth clean and protect your teeth.” This is what many people do, however, experts point out that brushing your teeth right after eating certain foods is not actually good for protecting your teeth.
Wang Jun, director of the Department of Stomatology at the First Affiliated Hospital of Tsinghua University, said that brushing your teeth after eating is necessary, but brushing your teeth immediately after eating sour and sweet foods is not the correct practice. According to Wang Jun, the acid and sugar in acidic and sweet foods can easily corrode teeth, causing demineralization. Brushing your teeth at this time can cause wear and tear on the enamel. Wang Jun suggests that after eating sour and sweet foods, it's better to rinse your mouth first to reduce the concentration of acid and sugar in the mouth, and then brush your teeth after the teeth have had some time to repair themselves for the best effect.
In addition, regarding the issue of "gagging while brushing" raised by some readers, experts pointed out that if there are no related diseases after a hospital examination, the gagging is likely related to small details of brushing. Some people use too much toothpaste. Excessive toothpaste, when rubbed in the mouth, creates a lot of foam that can stimulate the throat and cause nausea. Furthermore, many people brush their teeth with cold water. Brushing with cold water does not soften the bristles of the toothbrush, and it can easily cause gum bleeding if you're not careful, which in turn can lead to nausea.