From: "Rex"

After spending almost a grand, there seems to be not one Vet in Canada that
would diagnose this problem with our cat.

Have you tried a veterinarian dentist?
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See my cats: http://community.webshots.com/album/56955940rWhxAe
Raw Diet Info: http://www.holisticat.com/drjletter.html
http://www.geocities.com/rawfeeders/ForCatsOnly.html
Declawing Info: http://www.wholecat.com/articles/claws.htm