My 92 year old dad has not much of an appetite/ so difficult to get him to eat. teeth are excellent but he does has many heart problems?

Not a dental problem: I do not think this is a dental problem. You may want to have him evaluated by his general physician to see if there is a underlying medical or psychological problem like depression.

What sounds good?: Remember that elderly folks who are not very active do not need as many calories as they used to. That being said, however it is important that your father take in a sufficient number of calories and protein to ensure that he stays alert and strong. Sometimes as we age we lose our appetite as well. There are good tasting drink supplements which you can purchase at any drug store.