If the 10-12 remaining teeth are healthy, then it would be best to retain them and plan ahead for replacing the missing teeth. Replacement would now depend on whether you plan to have a removable denture or a fixed one. In case of removable dentures with the advent of flexible dentures the comfort levels would be much faster to achieve. But on a longevity of healthy bone and stability of artificial teeth, implant would be a prudent option considering the fact that your fathers medical health is good.
Next Steps
If by some reason you decide to have removable dentures, now is the time to give him those removable partial dentures to get him to adapt to full dentures at a latter date.
Health Tips
Always look at options which serve you on a term.
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