With dental caries caries will further erode the teeth, so that the hard tissues of the teeth are injured, so that the pulp is exposed, the tooth nerve is sensitive, sweet food acid production will soon stimulate the tooth nerve, so caries will be painful when sweet. Caries is not only sweet pain, other too cold, too hot stimulation will cause pain. Therefore, we should pay attention to eat less sweets and stimulating food to prevent further deterioration of caries. Also pay attention to oral hygiene, insist on brushing in the morning and evening, you can choose cold acid Ling toothpaste, there is an anti-allergic effect, can relieve the pain. Rinse your mouth with light salt water before going to bed, which has a positive effect on inhibiting bacteria and preventing tooth decay.