How much it costs to treat a rotten tooth depends mainly on the severity of the rotten tooth, which is mainly caused by tooth decay. If the rotten tooth is only a small cavity, it can be filled with resin material, and the cost is about 100-200 RMB. If the tooth decay is serious, a small piece of tooth has been lost, or even half of the tooth has been decayed. At this time, the root of the tooth may have been injured, and root canal treatment is needed, and the cost of root canal treatment ranges from 400-2000 RMB. In addition, in addition to root canal treatment, a crown will be placed on the tooth, and the material used for the crown will affect the overall price of treating the rotten tooth, so it depends on the specific situation of the tooth.