Father (67) with Alzheimer's has bad teeth. Should he get all teeth extracted and dentures or maintain oral hygiene?

My father was diagnosed with Alzheimers over a year ago. The disease progressed pretty quickly a year ago (he had a bad UTI) and he's not really able to understand a lot that is going on around him and make important decisions. That include his teeth. He's had bad teeth for years, and now it has come to a point where our usual dentist suggests that all his teeth get extracted and they put in dentures. This process takes weeks: 1. take a mold 2. take all molars out, then wait days/couple of weeks, 3. take another mold, 4. take all front teeth and put in the mold. Six months later, when the dentures are uncomfortable and the bone has mostly healed, another mold is taken and the dentures are adjusted. This process also includes us driving long distance from a small town to the city where the specialist is located. Last week our dentist sent us to the specialist that is involved in the case, the trip went fine but she said that my dad's teeth should not be removed, just those that are bad fixed individually and he should go regularly for cleaning (like every two months). She said that considering his status, it's better to maintain the ones he has than risking the process of removing them that could make him worse. Also, she said there's no guarantee that he'll accept the dentures. My biggest fear of not getting his teeth removed is the risk of infection and heart problems. It could take long time for us to notice something's wrong because apparently he doesn't feel much in his gums. I would love to get some feedback and experiences on issues like these that will help us take a decision on what to do.