Why do some people not develop cavities even if they do not brush their teeth well?

The likelihood of developing cavities depends not only on how often you brush your teeth, but also on saliva’s ability to neutralize acids, the proportion of cavity-causing bacteria in the mouth, and the structure of the tooth surface. ① If saliva neutralizes acids well and washes away food debris, the risk of cavities may be lower; ② if there are many cavity-causing bacteria or bacteria that tolerate acidic environments well, the risk increases. ③ Cavities are also more likely to develop when tooth grooves are deep or the enamel is weak. However, frequent sugar intake increases the risk of cavities, so it is advisable to assess your individual risk through a dental examination.