A biopsy is a simple surgery that removes samples of soft tissue or bone from the body. In the case of dentists, this may be gum tissue, a tooth, or a jaw piece. Biopsies are performed when the dentist or the physician wants to take a look at the sample in the laboratory. The goal is to find the sources of the abnormalities or lesions. They may be caused by illnesses or injuries. The lesions may be in the area of soft tissue or bone that looks abnormal. This can be a lump or a patch of skin that has a different colour or texture.