Celebrities live in lavish mansions, go on luxurious vacations, and get dressed by the hottest stylists, but at the end of the day, they aren’t too different from you. They go to the grocery store, pick their kids up from school, and, you guessed it, straighten their teeth with Invisalign. Keep reading to learn six celebrities who have clear aligners to thank for their picture-perfect smiles (including the one who referred to Invisalign as Netflix for your teeth!).

Once your braces are off, one small, but effective, tool will keep your teeth in their perfectly aligned positions: your retainer. Essentially, this orthodontic appliance is custom-made to keep your teeth in place as they “set” and help prevent orthodontic relapse down the line. Since wearing yours is a lifelong best practice, you naturally made need a replacement or two throughout the years. With this in mind, here are a few important signs to look out for!