Caries that has rotted and hollowed out can be treated by root canal treatment, dental implants after extraction, or prosthetics installation. Dental caries is commonly known as tooth decay, the emergence of dental caries, usually due to the surface of the teeth bacteria decomposition of food debris, the decomposition of the tooth corrosion bad, thus forming cavities. Generally, cavities cannot heal by themselves, and it is necessary to choose appropriate restorative treatment according to the severity of caries, such as root canal treatment, dental implants or installation of denture. 1. Root canal treatment: If the decayed tooth is already rotted and empty, but the root is relatively long and still has the value of preservation, root canal treatment can usually be considered. Root canal treatment can remove the necrotic tissues inside the root, and then repair it, and at the same time, it is also necessary to repair the crown, which can effectively alleviate the symptoms of dental caries. 2. Dental implants or denture: In the case of caries that has rotted out and the roots of the tooth are relatively short, there is generally no value in retaining the tooth. Generally, it is necessary to carry out anti-inflammatory treatment first and then extract the caries, and dental implants or denture restoration can be carried out in about three months. Dental caries restoration operation requires professional operation, it is recommended to go to the dental hospital timely and standardized treatment.