At the joy of the end of the day with a sleeping child. Then you hear the constant noise that come from that sweet face, which becomes so intolerable. All that constant grinding and gnawing of the teeth or bruxism as it is called. You wake her up just for it to start all over again. Bruxism is a term used to explain grinding teeth usually when asleep or under stress. Experts say the highest incidences of grinding teeth are of children under 5 years old. There are different causes but it is most thought that the teeth aren’t aligned correctly. Other children do it in response to teething pain or an earache. Most kids do out grow it.