Hmmm… there is little to be done. I have the same problem and, yes, I broke a tooth once. I bought my self splintek. This is a “device” which you put in your mouth at night and when grinding teeth, you actually grind your splintek, which is made form gum…this prevents you to break a tooth and some other things. For example, my neck was very uptight and I my back was stuck, as a consequence of teeth grinding.
But I really do not know if they produce this device for 4 year olds.
Regards!
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