All on Four Dental Implants: Case 15 - Dallas, Tx Cavities can destroy teeth. This was the case for our Dallas, Tx patient. His upper teeth were completely rotten to the gum line. The teeth were not predictably restorable, the alternative would have been a removable denture or 14 root canals, posts and cores on all the teeth, and crown lengthening, followed by 14 crowns. This would have been close to 50 hours in the dental chair! Patient opted for a more predictable approach, done in one day!