Starting Invisalign treatment is an exciting step toward a straighter, more confident smile. But if one of your aligners isn’t fitting properly, it can throw you off track. Whether your tray feels too tight, too loose, or isn’t seating all the way onto your teeth, it’s important to know how to respond without panicking.

The good news? A poorly fitting aligner doesn’t always mean your treatment is ruined or that you’ll need a whole new set. Here’s what you should do next.