My 16 year old cat has lost some weight recently (lost about 2
lbs...was 16lbs and is now 14).  We had blood work done and it came
back with some levels a little high but nothing to be concerned
about...also had a thyroid check and that came back fine.  He seems to
be eating less and when watching him eat, he seems to tilt his head to
one side and he chews very loudly (like someone who chews with their
mouth open that you can hear from across the room).  We made another
appt. with the vet so they can check his teeth later this week hoping
that's why he's lost the weight.  My question is if this does sound
like a tooth issue and if so, can the Vet determine for sure if it is
by just checking or do they have to put him under just to look at the
teeth?