How often can i need to replace my dental retainer?

Varies: Usually it is replaced when it wears out. This varies from patient to patient and with the type of retainer.

See a dentist: A professional can assess whether or not your retainer is worn to the point of replacement and if it is functioning as designed.

Depends: Depends on the design and how often you wear them. If it is clear aligner style, it may crack or stretch and therefore not work well, often replace once per year. If hard plastic with wires (like the photo), they may last longer. If you see your dentist twice per year, bring your retainers for their evaluation.

See Orthodontist: Retainers are custom made and require periodic replacement. Best person to do this, and to determine if your current appliance requires replacement, is the specialist Orthodontist or General Dentist who did your Orthodontic treatment.