A cavity in a tooth is actually a dental disease known as dental caries. It is good to repair it to maintain the normal function of the tooth. There are various methods to fill the cavity, mainly depending on the specific state of the caries using different methods. The cost varies from several hundred dollars to several thousand dollars. After the occurrence of tooth decay, due to the weakness or disappearance of the protective tissue on the surface of the tooth pulp, toothache and tooth allergy will occur, and the treatment is still necessary. The method usually used is to repair the cavity with some special materials after performing root canal treatment. This method is mainly used when the cavity has penetrated deep into the pulp of the tooth, which is the most common case of receiving a cavity repair today. Before the repair can be done, several root canal treatments must be done, which cost about 100+ dollars a time, and then the repair is done. There are more materials available for the repair, such as dental composite resin, ceramic or dental amalgam, each of which can cost from a few hundred dollars to several thousand dollars. So the cost of this method of filling a cavity varies from high to low. Some people, who are extremely conscious of their dental health, will often visit the dentist to check their dental problems. They may find a relatively superficial cavity. This kind of tooth decay belongs to relatively light, in fact, it is also necessary to repair. Generally, it is treated with fluoride to cover the superficial caries surface, which can help to protect and restore the tooth enamel and can prevent the aggravation of caries. The cost is relatively cheap, a few hundred dollars a time. The composition of medical cost is sometimes a complicated issue. It has a lot to do with the region and the level of the hospital where you visit. The most important factor affecting the cost is the severity of the caries and the choice of materials.