I still can't work out the reasoning in leaving it for 3 months though, just cos they aren't upsetting his tummy, there are still risks to organs by leaving dodgy teeth.
It would be interesting to see what your vet says about leaving him on such a high dose Jane, as my vet gave me a wishy washy answer when I asked about Sam - but to my mind, if they have come down so much on that dose, wont they keep reducing at that rate? I would have thought they would then need a maintenance dose rather than the same dose?