DS is almost 2yrs and will only chew not brush. He shrieks if I try to brush his teeth for him and doesn't like toothpaste (fair enough he'll only swallow it anyway!). I don't want to push him too hard because he hasn't quite got the dexterity yet and I want it to be a fun thing (I have tried making up fun songs etc while brushing). Will I really ruin his teeth if I don't force him now? They're going to fall out anyway.