I've been a dental assistant for over 20 years now. I have heard of meth mouth. It is comon for drug users and also people with financial hardships to have dental problems. If you don't have the money or frame of mind to get checkups, then usually by the time you can feel something is going on it is a bigger, costlier problem. Instead of a simple filing for $90, it ends up to be a root canal for $695 then a crown for $800 or an extraction. I would sure think hard about putting $10,000 in an adicts mouth. just because a root canal & crown is done, doesn't mean the tooth still can't decay at the margins. You need to have good home care to protect your investment. Perhaps a full upper denture and try to save 4-6 teeth on the lower and get a partial denture . An upper denture isn't that bad to get used to, and can make tings look good cosmetically. But a fuul denture on the lower is very very hard to get used to. A partial isn't that bad on the lower.