trying to fit ds' gum shield but it makes him gag and he won't put it right in his mouth - I tried on me and it did make me gag a bit and obviously ds' mouth is smaller...can you trim them ? I have suggested he plays around with it,getting used to putting it in his mouth and gradually putting it further in before we can fit it properly. Failing that, would our dentist do it,do you think ? he was getting v stressed and dh was getting cross - arghh !