The Tooth Gem procedure is generally not painful. The process involves applying a small gem to the tooth's surface with a special adhesive. This adhesive is designed to be gentle on the tooth, and most people don't experience any pain or discomfort during the procedure. Some people may experience a slight tingling sensation when the adhesive is applied, but this should not be painful. After the procedure, patients may experience some sensitivity to hot and cold temperatures, but this should dissipate within a few days.