If caries is found in a 5 year old child, it is important to treat it in time because children’s front teeth are replaced at about 7 years of age, and the back teeth are not replaced until the age of 12 weeks. And in these years caries will continue to develop, and in serious cases it will develop into pulpitis and periapical inflammation, which will bring a lot of pain to the child, and will also affect the child’s digestion and bring bad mood. And permanent teeth are guided by the development and growth of milk teeth, if the milk teeth are not healthy, will directly affect the development of permanent teeth, so there are dental caries must take the child to the hospital in time for treatment, the treatment is not complicated, only need to grind off the caries part of the tooth filling, repair can be, after the filling of the teeth to pay attention to oral hygiene, to prevent the occurrence of more dental caries.