While looking something up for Slick, I remembered that Ash has been pulling out his hair. Take a look at this link, Carole:

http://www.celiahaddon.co.uk/pet%20p...utilators.html

Perhaps talk to your vet about it and see what s/he says. My RB Puddy had BMS among other things and I gave her B vitamin injections directly into her subQ fluids. I know that you aren't giving subQ's but perhaps your vet can give him the B vitamin injection. It helped Puddy tremendously. It's worth a shot. (Pardon the pun.) It might not be Ash's teeth at all but perhaps his tongue that is giving him the problem. From what I've read, BMS can be painful and quite annoying. If Ash's fur pulling happens again, I'd definitely take a look, if I were you.