After the failure of dental implant, the implant should be removed and the inflammatory tissue should be thoroughly cleared, and then the corresponding treatment should be carried out according to the following conditions: 1. If there is no inflammation and there is sufficient bone and the bone wall is thick, a new implant can be planted and the restoration can be completed after three months; 2. If the bone wall is slightly thin or there is local inflammation, the inflammatory tissue should be cleared and the implant should be planted after three months; 3. If the bone defect is large, artificial bone powder material should be implanted for bone augmentation and the implant should be planted only after six months; 4. If the difficulty or risk is large or the patient does not want to plant the implant, other restorative methods can be considered.