On one of our many recent visits, the vet did notice a tooth that looked like it might need to come out soon.

I did ask if that would affect his desire to eat, and she said that the gums etc. were not inflamed around it, so she did not think it was causing him any pain.

I will ask again when we see the vet on Friday - thank you for reminding me of that - like you said - sometimes the simplest things can be overlooked.