Hi Bryanna,
Periodontal desease runs in my family. Both parents, siblings, we have all had to deal with it hence my manic approach for oral hygiene. We went to Greece last year to see my cousins (same age as me) and other family and they all had issues with their teeth/gums/jaw bone.
On the other hand, my georgous husband (and his parents & siblings) have teeth like horses! Strong and solid, even the 78 year old mother in law. My husband spends less than 1 minute brushing morning and night and has never flossed.
I have all the gadgets, good quality electric tooth brush, 2 picks, several toothpastes, at least 5 floss containers (wide tape, thin tape, waxed, not waxed, flavoured, etc) those little brush thingies....he has 1 tooth brush and that's it

go figure, genetics.
In regards to my bottom molars, when I was 10 or 11 I was sent to a dentist because of some decay in the molars. In his wisdom he removed about 80% of the teeth surface and put amalgam in their place. Many years later with fractures along the gum line another dentist needed to replace the fillings with more amalgam. About 10 years ago the roots of the molars just collapsed and were removed. This would have been the perfect time to have implants but I wasn't aware they existed and the dentist never mentioned it.
Luckily all my remaining lowers are in good nick and haven't shifted around. I'm having the two end ones capped though, to protect them from further wear as they do so much work!
In my early 20's I needed a root canal on my upper canine. The dentist accidentally put that little file through the root (sideways) through into the gum. He showed me the x-ray and packed me off to a surgeon where my gums were lifted and the root was patched up.
That tooth snapped off a few years later and a bridge was placed. I'm having that and other old veneers (upper area) replaced in a couple of weeks.
I'm calling it a complete mouth reconstruction. Lol!
Thanks again for your thoughts and comments, appreciated.
PS: this time I'm being advised by an implantologist and specialists in this field.