At 12 years of age all permanent teeth have erupted and crowns can be made if the indications are met. At the age of 12 years old, you are already in the permanent dentition period, and normally all permanent teeth have erupted. A broken tooth is usually a defective tooth, which can normally be treated with a filling. However, crowns can be made if the following conditions are met. 1. The dentin defect is too large, the remaining dentin tissue of the crown is weak, the filling material is difficult to withstand the chewing force and easily deformed and fractured. 2. If the filling material cannot obtain sufficient retention force and is easily dislodged. 3. Those who need to raise or restore the bite. However, it should be noted that with age and jawbone development, crowns may need to be replaced, and it is recommended to consult a professional doctor for details.