This is a very common problem especially in this age group. The cause is not usually found but may be related to the time when she was getting her molar teeth. Teeth gringding is usually very persistent,long lasting and also very difficult to stop.It usually stops when the permanent teeth start coming through.You can try giving your daughter a safe antihistamine called Aterax syrup at night,she can take half a teaspoonful at night. If her teeth grinding persists it would be a good idea to ask your dentist to see your daughter as her teeth may be ground down especially the molar teeth.
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