B.H.
I just asked the dentist about this with my 6year old. I was told there isn't much we can do, and it's not serious until she has her permanent teeth in. And she hasn't lost any teeth yet.
I was showing a neighbor her teeth about something else, and she's a assistant in a orthodontist office or something and she goes "Does she grind her teeth?" I was like ya how do you know? She said she could tell. I was like wow this may be a bigger problem then I thought.
My 6 year old still sleeps in my bed and when she grinds it wakes me up, I will tap her, touch her, shake her, tap her face anything to get her to stop and she won't wake up or stop.
I figure next time we go in I will ask the dentist at what point can I get her a nightguard so she doesn't ruin her future permanent teeth. A nightguard is the only thing I can think of to stop it and they have to be atleast schoolage I would think to wear something like this.