MY 7yr old daughter has been moving her mouth constantly, opening and closing her mouth as well as stretching her upper lip up and down. I checked her mouth and she has a sore on her inner cheek, perhaps a canchor sore. I also think she bites her cheeks when she sleeps.
Hi. Thanks for the query. As per your complaint a sore on the inner cheek can probably a canker sore and biting of cheek during sleep or there can be a habit of teeth grinding or bruise or teeth clenching. In case if she is continuously opening and closing her mouth and stretching her lip just now and is not a regular habit then it can be related to pain in mouth or any stress or anxiety related situation. For sore, you can apply numbing gel containing Lidocaine over it. Vitamin B complex should be given. Make her suck ice lollies and give her a soft diet. Hope this helps. Regards.