10. Retainers
Duration: 6 months to 3 years
* The average cost for a single dental arch is $150–$300.
Retainers help maintain straight teeth and a beautiful smile. The lifespan of a retainer depends on its type, with bonded retainers lasting up to three years and removable ones lasting six months to a few years.

Retainers: ©Shutterstock/AUWAE Photo
Replace your retainer if it becomes damaged, doesn’t fit properly, or shows signs of wear. Consult your dentist for advice on when to replace it.