honestly from experience there isn't alot you can do. she is experimenting with that new tooth. its more annoying for us than them. when my 5 yr old used to do it i thought something was wrong. took her to the dr. the dentist nothing was found. i started gentally cupping her jaw in my hand so she couldn't grind her teeth. after about 2 weeks of it and repeating stop grinding your teeth she did stop. it was more a way to force her into eye contact because she is autistic but it also prevented her from grinding her teeth. i still use the method for other things like if she get frustrated she will screech and i'll cup her chin force her to look at me and gentally say mommy didn't yell at you. it works well.