Ok, I can't speak to the infections overall, but I can speak to implants/bridges. Bridges cut down healthy teeth and compromise them. As far as implants go, you need to have great hygiene-brushing, flossing, and I also use a waterpik. I get my teeth cleaned every 6 months anyway, so having them check my implants then is no big deal. If you don't think implants are the right choice, perhaps a partial denture so that your remaining healthy teeth aren't compromised?

I've had crazy amounts of root canals. If have to go count, but I want it was 20+. I regret that. I wish I had pulled them instead of keeping them in my body while infected.

I have personally experienced aggravated health issues because of dental issues. There is no doubt in my mind that dental work can thrash your whole body.