Yes, a failed dental implant can often be replaced. When an implant fails, it may need to be removed and replaced with a new implant. The treatment plan for replacing a failed implant will depend on the specific reason why the implant failed in the first place. If the failure was due to insufficient bone support or infection, additional procedures such as bone grafting or antibiotics may be required before a new implant can be placed. In some cases, a patient's overall health or lifestyle factors may also need to be addressed to improve the chances of success with the replacement implant. It's important to discuss any concerns about a failed implant with your dentist or oral surgeon to determine the best course of treatment for your individual needs.