A biopsy is a common practice in the medical field. When a biopsy is performed, a small tissue sample is removed to find out if it has any diseases. Within the dentistry world, gums and teeth are sent for biopsy. They are commonly used to diagnose oral cancer. A brush biopsy will identify oral lesions that solicit further investigation.
Should you find any inexplicable lesions in your mouth, they should be looked at by a dentist immediately. It is possible that they may not be cancerous, but they should be examined nonetheless.