Cavities in the large milk teeth need to be repaired, and they need to be repaired as soon as possible. The big teeth are usually the molar teeth behind the milk teeth, and the most common are the first and second molar teeth. Tooth decay refers to the symptoms of dental caries due to bacterial invasion of milk teeth, which needs to be treated as early as possible, because due to the texture of milk teeth, once dental caries occurs if not treated as soon as possible, the caries will progress faster, and then it is necessary to prevent further development of dental caries through the removal of corrosion and filling treatments. If treatment is delayed, the caries will eventually encroach on the whole tooth, and it may be necessary to extract the whole tooth, which is a more serious problem. Moreover, if the corresponding gap side is not protected, it will not only cause tilting and shifting of the neighboring teeth, but may also affect the condition of the permanent teeth. Therefore, caries in the large baby teeth should be repaired not only as soon as possible, but also as soon as possible.