How Should a Night Guard Fit? Signs of a Good (and Bad) Fit

What a Good Fit Feels Like

• Snug: it clicks or presses into place and stays put without adhesive.
• Even pressure: gentle, even pressure across your teeth, with no single sharp spot.
• Stable: it doesn’t fall out when you open your mouth or swallow.
• Comfortable edges: the edges don’t dig into your gums, cheeks, or tongue.
• Easy removal: it comes out with gentle pressure from the back edges.

What's Normal in the First Week

Some tightness, extra saliva, and awareness of the guard are normal for the first few nights. Most people adjust within about a week. Mild pressure that fades within an hour or so of removing it in the morning is also common.

Signs Your Night Guard Is Too Tight

• Sharp pain or pressure on specific teeth that doesn’t fade
• Soreness that lasts well into the day
• You have to force it on or pry it off
• Gums look irritated where the edges sit

Signs Your Night Guard Is Too Loose

• It falls out during the night or when you open your mouth
• You find yourself clenching to hold it in place
• It rocks or shifts when you bite

A loose guard can also be a sign it’s worn out. See signs your night guard is not working.

Custom vs. Boil-and-Bite Fit

*As reported by GoodRx.

What to Do If Your Night Guard Doesn't Fit

1. Rinse it in lukewarm water and try seating it with even pressure from both sides.
2. Give it a few nights, unless you have sharp pain.
3. If it still doesn’t fit, stop wearing it and contact the maker. Never trim or heat a custom guard yourself.

FixUrSmile’s Custom Fit Guarantee covers fit issues reported within 30 days, with a free adjustment and, if needed, one free remake after review.

How Should a Night Guard Fit: Frequently Asked Questions