CROSSBITE
When you close your mouth and some of your upper teeth are sitting inside your lower teeth — rather than on the outside, like they normally would — your doctor calls this a crossbite.
A crossbite can make your teeth wear down or chip. It can also make your gums start to recede or make little notches above your gum line.This kind of damage can lead to painful gum problems or even bone loss.
Yes, @-aligners can fix some types of crossbite.