This patient is likely to have further complex problems with his front teeth due to the extent of the decay. Decayed teeth if untreated eventually get damage to the nerve inside and end up needing root canal treatment to save, and also the tooth can be so weakened that it can break off. Fortunately, we have been able to repair these teeth with filling for now. These teeth are still at great risk, but the fillings will stabalise the problem and should be serviceable for a few years. The advantage is that all this could be fixed in one day for a few hundred dollars with a very cosmetic result.
The front tooth without any decay is a root treated and crowned tooth treated many years ago.