[Celyn]

I agree with Dez. If your dog needed his teeth cleaned, it may have been that there was a build up of plaque, which if left untreated, can lead to cavities and tooth decay. This can also increase the sensitivity of the teeth. But it's promising if there aren't any visible problems.

There could be other causes- perhaps your dog had a recent injury in his mouth that is leaving him sore (for example, if your dog catches/picks up sticks in his mouth, they can splinter and cause injury). Or maybe he has an abscess or ulcer.

Hopefully the x-rays will help to identify or rule out what the problem might be and your vet will be able to give further support!