A tooth gem typically lasts anywhere from 6 months to 2 years, depending on the type of material and the care taken with it. It is essential to follow proper care and maintenance instructions to maximize the life of your tooth gem. For example, avoid eating hard foods, brushing or flossing directly over the gem, and not exposing it to extreme temperatures. Additionally, make sure to regularly clean the gemstone with a soft bristle toothbrush and non-alcoholic mouthwash. Proper care will help ensure that your tooth gem lasts for as long as possible.