Greyhounds are prone to dental issues (I read somewhere it’s to do with the shape/length of their dental arcade). He won’t miss a tooth or two but it you want to try and prevent him from losing any more it’s best to try and introduce a regular clean if you don’t already, using a soft toothbrush and specific doggy toothpaste (we use beaphar branded stuff but there are plenty on the market). If he’s been a racing dog it is likely that he will be used to having his teeth cleaned (Buddy mercifully was) but that might not be the case. If not, you can start him off by applying toothpaste along your finger and let Murphy lick it off. Then you start applying your pasted finger to his teeth (as if your finger was the brush). Then use a finger brush with toothpaste, and if you need to, progress to a soft brush.