How to Clean and Care for a Night Guard or Retainer

By Dr. Boris Zusin · Published August 2, 2026

A custom night guard or retainer is a real investment, and how you care for it affects both how long it lasts and how comfortable (and hygienic) it is to wear night after night. The good news: proper care takes less than a minute a day.

Rinse It Every Time You Take It Out

Rinse your appliance with cool water immediately after removing it in the morning, before saliva and plaque have a chance to dry onto the surface. Avoid hot water — it can warp acrylic and some plastics, changing the fit permanently.

Brush It Daily — Gently

Use a soft toothbrush (a separate one from your regular brush is a good idea) and a small amount of mild soap or a non-abrasive cleanser to brush both sides of the appliance daily. Skip regular toothpaste — many are abrasive enough to create tiny scratches over time, which trap bacteria and cloud the plastic.

Do a Deeper Clean Weekly

Once a week, soak your appliance in a denture or retainer cleaning solution, or a mix of water and a small amount of white vinegar, for about 15–20 minutes to clear buildup that daily brushing alone can miss. Rinse thoroughly afterward before wearing it again.

Store It Properly When Not in Use

Always store your appliance in its case when it's not in your mouth — never wrapped in a napkin or tissue (a surprisingly common way these get thrown away by accident) and never loose in a bag or pocket, where it can warp, crack, or pick up bacteria. Let it air dry for a few minutes before closing the case if it's still damp.

Keep It Away From Heat

Don't leave your appliance in a hot car, near a radiator, or run it through the dishwasher — heat is the most common cause of warping, and a warped appliance no longer fits the way it should, which defeats the purpose whether it's protecting your teeth from grinding or holding orthodontic results in place.

Signs It's Time for a Replacement

Watch for visible cracks, a fit that feels looser or different than it used to, persistent odor that cleaning doesn't resolve, or cloudy discoloration that doesn't clear with a deep clean — any of these mean it's time to have it checked and likely replaced, since a poorly fitting appliance is far less effective.

If your night guard or retainer isn't fitting the way it used to, bring it to your next visit and we'll take a look. Learn more about how these appliances work on our TMJ & bite appliances page.