Protrusion revision is a pre-prosthetic surgical procedure, i.e., a step that needs to be performed after tooth extraction and before veneering, usually 2-3 months after extraction. At this time, the first alveolar process is already stabilized and the healing of the alveolar socket is basically completed. At this time, the patient’s pain can be reduced and a series of operations such as veneering and mold taking can be performed in a very short time. Of course, if the alveolar process is found to be sharp and the bone scab is obvious at the time of extraction, it should be done at the same time as the extraction, instead of waiting for 2-3 months, which will increase the patient’s pain. In fact, it is not necessary for all patients to undergo alveolar revision before veneering, but some patients need to be evaluated by a prosthodontist before veneering. If the alveolar process around the extraction socket is smooth, it is not necessary to perform an alveolar revision; if there is some sharp bone crust, it is necessary to perform an alveolar revision before veneering.