Night Guard Not Fitting Right? Here’s How to Fix It

March 26, 2025

A night guard should fit snugly and comfortably—but what if it doesn’t? Whether it’s too tight, too loose, or just feels "off," an ill-fitting night guard can cause pain, slipping, or even worsen grinding.

This guide covers common fit problems and solutions, so you can protect your teeth without discomfort.

Common Night Guard Fit Issues (& Fixes)

1. "It’s Too Tight or Hurts My Teeth/Gums"

✅ Possible Causes:

New custom guard needs breaking in
Teeth may be shifting (e.g., after dental work)
Improper molding (boil-and-bite guards)

🛠 How to Fix It:
✔ Wear it for short periods first (1-2 hours/day) to adjust.
✔ Rinse with warm water before inserting to soften slightly.
✔ Check for pressure points—gently sand rough edges with a nail file (if DIY guard).
✔ See your dentist if pain persists—they can adjust the guard.

2. "It Slips or Falls Out at Night"

✅ Possible Causes:

Loose fit (common with OTC or worn-out guards)
Dry mouth reducing suction
Wrong size (boil-and-bite not molded properly)

🛠 How to Fix It:
✔ Re-mold a boil-and-bite guard (reheat and bite down firmly).
✔ Try a dental adhesive (e.g., Poligrip for dentures) for temporary hold.
✔ Switch to a custom guard—better grip and long-term fit.

3. "It Makes Me Gag"**

✅ Possible Causes:

Too thick or bulky (common with OTC guards)
Covers too much of the palate

🛠 How to Fix It:
✔ Try a thinner, custom guard (sits closer to teeth).
✔ Look for an "anterior-only" guard (covers just front teeth).
✔ Practice wearing it during the day to desensitize your gag reflex.

4. "It Feels Uneven or Rocks When I Bite"**

✅ Possible Causes:

Warped from hot water or improper storage
Teeth have shifted since guard was made

🛠 How to Fix It:
✔ Soak in warm water and re-seat it (for minor warping).
✔ Check for debris—clean thoroughly before use.
✔ Ask your dentist for a reline or replacement if your bite has changed.

When to Replace Your Night Guard

Even well-fitted guards wear out. Time to replace if:
🔹 Visible cracks, thinning, or holes
🔹 Persistent odor/taste (bacteria buildup)
🔹 Loose fit after years of use
🔹 New dental work (fillings, crowns) altering your bite

💡 Custom guards last 2-5 years; OTC guards last 6-12 months.

Preventing Future Fit Problems

✔ Store properly—keep in a ventilated case (not in hot cars or sunlight).
✔ Clean daily—brush with mild soap and rinse.
✔ Avoid DIY adjustments—don’t trim or sand custom guards without professional help.

Still Not Fitting Right?

If adjustments don’t help:

See your dentist—they can modify or remake your guard.
Try a different type—a slim custom guard (like New Smile Life’s) may solve the issue.