Lateral caries is not very good. 1. Lateral caries are caries that occur on the adjacent surfaces of teeth. When caries is located on the adjacent surface of a posterior tooth, the cavity that needs to be prepared is called a Type 2 cavity. The cavities that need to be prepared on the adjacent surfaces of anterior teeth include Type 3 cavities and Type 4 cavities. In preparing the adjacent cavities, it is necessary to enter from the maxillary surface, remove the marginal ridge to reach the neighboring caries, grind the carious tissues, and expand the edges of the cavity to the self-cleaning area so that the gingival wall is parallel to the maxillary surface. 2. When filling, pay attention to fill the distal neighboring surface first, then fill the jaw surface, pay attention to restore the neighboring contact relationship to avoid the formation of gingival margin overhang and stimulation of the gingival papilla. Only when the neighboring contact is restored, it is not easy to cause food impaction, and the filling can stay on the teeth for a long time and is not easy to fall off, so it is more difficult to fill the caries on the side. Usually pay attention to oral hygiene, morning and evening brushing, so as not to aggravate the symptoms of dental caries.