Eating sugar does not usually cause toothache, but after eating sugar, toothache may be related to dental caries, or periodontitis, pulpitis and other diseases. If the teeth are normal, and there is no disease, eating sugar basically will not lead to toothache symptoms, but if caries has already appeared, after eating sugar oral sugar increases, may lead to bacterial growth, so there will be toothache symptoms. Clinically, eating sugar after periodontitis, pulpitis and other diseases may stimulate dental caries or root exposure, may also lead to increased oral secretions, thus aggravating the pain. Usually, we must pay attention to personal diet, maintain a light diet, eat less food containing more sugar and salt, if you find abnormal symptoms, it is recommended to actively seek medical attention.