At the age of 18, if the teeth lost are retained milk teeth, permanent teeth may still grow out; if the teeth lost are permanent teeth, no more teeth will grow out. 1. Retained milk teeth: If the teeth lost at the age of 18 are retained milk teeth, the teeth will still grow out as long as there are inherited permanent embryos; if they cannot erupt on their own, they will need to help the permanent teeth to erupt by means of surgery; if there are no inherited permanent embryos, there will be no more teeth to grow out. 2. Permanent teeth: If the teeth lost at the age of 18 are permanent teeth, no more teeth will grow out. In this case, only dental implant restoration or other denture restoration can be carried out to restore the function and beauty of the teeth. 18-year-old teeth lost in time to the hospital to take dental apical film, to determine whether there is a permanent tooth embryo, and then choose to help the permanent tooth eruption or denture restoration, to restore the beauty and function of the teeth.