If you lose a tooth, you can choose to temporarily observe and make a gap retainer; if it is a permanent tooth, you can choose dental implant restoration and fixed bridge restoration; if it is a wisdom tooth, you do not need to carry out special treatment. 1. Temporary observation: if a baby tooth has been lost and the permanent tooth has already erupted, in this case, it is enough to maintain good oral hygiene and oral habits to facilitate the normal eruption of the permanent tooth. 2. Making gap retainer: when a milk tooth has been lost and the permanent tooth has not yet erupted, it is necessary to make a gap retainer to ensure that the permanent tooth has enough space for eruption. 3. Dental implant restoration: It is best to choose dental implant restoration for one lost permanent tooth, the biggest advantage is that it will not damage the neighboring teeth, the only disadvantage is the high cost. 4. Fixed bridge restoration: If one permanent tooth is missing, you can also choose fixed bridge restoration, the disadvantage is that you need to grind the teeth before and after the missing tooth, but the cost is lower than dental implants. 5. No special treatment: If the lost permanent tooth is a wisdom tooth, it does not need to be repaired, but to maintain good oral hygiene to prevent post-extraction infection. If you lose a tooth, go to the hospital in time to clarify the position and nature of the tooth and choose the best treatment plan.