My suggestion is to pull out that deformed tooth! ~ Because it's already active! ~ and it's not very nice! ~ You can make an invisible denture for your father after pulling it out, because it doesn't need too much trouble to make an invisible denture! You don't need anesthesia! ~ Your father may be more receptive! ~ just make a model of your father's mouth! ~ but to make a contact denture, you need the health of your adjacent teeth. The first cost of porcelain and dental implants is very high, and the second production process is very complicated! ~ I don't think your father can handle it! ~ as for some sunken gums, don't worry about them, they will grow better naturally! ~ Generally, dentures can be made after three months of tooth extraction! ~ you still have to plan ahead. If the missing time is too long, it will grow on the jaw teeth, which will have adverse consequences for dental implants! ~ I wish your father a healthy oral cavity as soon as possible