Sorry no tips from me, I've got a 2yo who is pretty much the same. I'm probably contributing to the problem, because I've not been consistent with it, some days I just forget . I'm trying to improve, and basically get in there, even for it's only for a few seconds, and I'm telling him what I'm going to do, - ie mum's going to brush the top teeth, mum's going to brush the bottom teeth. Sometimes he's okay with it, other times it's a real battle.