Maybe you should go get another opinion. I have been told by numerous drs that going to dentures could make it worse. My current dr told me there are 2 schools of opinions on this - some say it can help b/c the dentures can be made to correct a poor bite - others feel it can make things worse by changing the bite too much, changing the space or vertical height within the mouth and strain the tm joints, causes bone recession, etc. Unless there are no other options in saving or fixing your teeth I wouldn't recommend it - of course I realize the cost of fixing badly damaged teeth can be a hinderance as well, and that can have an impact on your decision. Who is doing the dentures - I would speak with them about your concerns of continued grinding or clenching. I know one dr I did see about possibly going to dentures said he insisted all his patients that wore dentures also wear a nightguard - maybe that might help.