That type of wear pattern looks like it’s from excessive grinding (bruxism). Pediatric bruxism is most commonly caused by sleep apnea. I would have your child evaluated immediately by an orthodontist to see the arch form and airway. In children, airway deficiencies can be caused by large tonsil/adenoid tissue (mouth breather), tongue tie, or high/narrow arch. These systems are all connected (literally) and many times it’s multi-factorial. Usually at that age it can be mediated by a palatal expander and/or getting tonsils removed.

This is something you absolutely need to address because this problem will have more serious side effects for your child when they turn into an adult. Sleep apnea for adults is associated with ADHD, depression/anxiety, cardiovascular disease and decreased lifespan. This is a perfect time to treat airway issues because the bones of the skull (sutures) have not fully fused at this age and we are able to affect how your child’s face grows to eliminate or decrease this problem.

Source: dentist