If the last tooth on the lower right is half lost, you should go to the hospital in time, and the doctor will carry out crown restoration, root canal treatment, dental implants and other ways of treatment for the defective condition. 1. Crown restoration: if the last tooth on the lower right is half lost, and if the defective part is in the gums or not too deep under the gums, then the doctor will give the remaining tooth root canal treatment, and then carry out crown restoration after the inflammation is stabilized. 2. Root canal treatment: If the last tooth on the lower right is half lost, if the defective part is deep under the gums and the patient’s root is long, the edge of the defect can be exposed on the gums by methods such as orthodontic traction or crown lengthening surgery and root canal treatment can be carried out. 3. Dental implant: If the last tooth under the right is half lost, if the edge of the defect under the gum is very deep and the root of the tooth is not very long, it cannot be fully restored even by root canal treatment, and it needs to be extracted and then treated with dental implant. Half of the last tooth on the lower right indicates that the tooth has been badly damaged, so you should go to the hospital as soon as possible, and standardize the treatment under the guidance of the doctor.