💚 Updated October 23, 2025 — we’ve refreshed this article with new insights to help you choose the most comfortable and effective night guard for your smile.
Medically reviewed and verified by: Dr. Lara Coseo, (DDS, FAGD) is a 2004 graduate of Baylor College of Dentistry in Dallas, Texas. Having practiced general dentistry for 13 years, Dr. Lara currently serves as an Associate Professor at Texas A&M College of Dentistry.
Upper or lower dental night guard? Which one do I choose?
🔍 Quick Answer
Most people can protect their teeth with either an upper or a lower night guard, but the best choice depends on your mouth anatomy, gag reflex sensitivity, and comfort preferences. If you’re unsure, a custom guard from Sentinel crafted for your bite gives you the flexibility to wear either with equal protection.
This article is part of our Complete Night Guard Guide, where we break down everything you need to know before choosing the right night guard for your needs.
1. Why Wear a Night Guard at All?
Every time you grind or clench your teeth at night, your enamel wears down, cracks can appear, and your jaw muscles strain. A custom night guard creates a protective barrier — letting your teeth slide instead of smash — and prevents serious dental damage over time.
2. Upper vs. Lower Night Guard — What Are the Differences?
| Feature | Upper Guard | Lower Guard |
|---|---|---|
| Common Use | Most frequently prescribed | Less common; often used for gag reflex or lower-arch preference |
| Gag Reflex Impact | May cause less tongue interference | Sitting lower may reduce gag response |
| Bulk Perception | Slightly more visible in the mouth | Often feels “slimmer” when talking or sleeping |
| Available Space for Teeth | Covers upper biting surfaces fully | Fits lower arch, may feel tighter depending on teeth alignment |
| Fit Considerations | Often more consistent since upper arch is wider | Lower arch varies more; may need more adjustment |
Tip: A well-fitted guard matters far more than which arch you choose.
3. How to Decide Which One’s Right for You
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Gag reflex issue or large tongue space? → Consider a lower guard.
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Feeling of bulk, speech interference, or comfort is key? → Upper guard often better tolerated.
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Have an overbite or large upper arch? → Upper guard may provide better surface coverage.
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Prefer minimal visibility? → Try a slim custom lower guard.
Most users start with an upper night guard since it’s the most commonly recommended by dental professionals, and only switch to a lower guard if comfort or anatomy makes it a better fit.
👉 Explore our full range of custom night guards here
4. Why Fit > Type
Strongly emphasise that the quality of fit and material trumps arch type. A custom guard molded from your impression will always outperform general “upper vs lower” distinctions. A snug appliance that stays in place all night — regardless of whether it’s upper or lower — is what really matters.
To learn more:
5. When Might You Need Both?
In rare cases you might hear suggestions like “wear both upper and lower guards.” That’s not typically recommended because it can interfere with jaw alignment and breathing. Good fit and material quality prevent the need to cover both arches.
❓ FAQ
Q: Can I wear a boil-and-bite guard for temporary use?
A: Yes for short-term use, but for consistent clenching/grinding you’ll get far better protection and comfort from a custom guard made to your arch.
Q: How long does a night guard last?
A: Lifespan varies by habit, material, and care. Most custom guards last 12-24 months. If you notice cracks, looseness, or tooth sensitivity return — it’s time to replace.
Q: Will a lower guards stop snoring or sleep apnea?
A: Not necessarily. Guards are designed for teeth protection and muscle relief. For snoring or sleep apnea you’ll want a dentist-approved device tailored for airway health.
Q: Is mold on the guard a sign it’s not working?
A: Mold = poor hygiene risk. A guard still “working” structurally might wear fine, but bacterial growth means you should deep-clean or replace.
✨ Final Thoughts
Choosing between an upper or lower night guard doesn’t have to be complicated. The key is to pick a custom-fit guard that stays secure all night long. At Sentinel, we ensure your guard is tailored to your bite and designed for maximum comfort — whether upper or lower doesn’t change that core protection.
💚 Shop Sentinel Custom Night Guards
