When is it ok to cover a maxillary tori with your denture base? Sometimes medical issues preclude surgical removal of tori. Sometimes a patient just doesn’t want to go through the surgical procedure. The key to a successful denture in this case is whether or not an effective post dam can be created behind the tori. If not, the denture will not have retention. The tissue over palatal tori tends to be thin and pressure from the denture base can cause a sore spot so be sure to provide at least 2 mm of thickness over the tori to insure that you will have enough acrylic for adjustments without perforating the base….