There are cavities (i.e., caries) black and black, can be treated with medication and surgery. 1. Medication: For patients suffering from early demineralization, silver ammonium fluoride preparation can be used to treat cavities, which can stop the progress of demineralized caries. However, it should be noted that silver ammonium chloride will lead to darkening of the teeth, and it is usually used for milk teeth. 2. Surgical treatment: If caries develops and causes substantial defects in the dental tissues, which cannot be repaired on its own, it is necessary to choose filling surgery to treat it in order to restore the original form and function of the teeth. Patients can also choose composite resin direct bonding restoration, suitable for anterior teeth and large caries teeth restoration. Inlay restoration can also be considered if there is a large loss of tooth tissue. For patients with caries, they should go to the local formal hospital, according to the individual situation, with the doctor to choose the appropriate placement treatment.