In this article
Medically reviewed by Dr. Nermeen Khazan, BDS — an AHPRA-registered dental practitioner, for clinical accuracy.
People use "night guard" and "mouthguard" interchangeably all the time, and it causes genuine confusion at the point of buying one. They look similar. They both go over your teeth. But they're built for completely different jobs, and using the wrong one for the wrong purpose either won't protect you properly or will be uncomfortable enough that you stop wearing it.
The Core Difference
A mouthguard is designed to absorb a single, sudden impact — a ball to the face, a collision on the field, a fall. A night guard is designed to withstand hours of sustained, repetitive grinding pressure through the night. Different forces, different engineering.
Sports Mouthguards
Sports mouthguards are built thick and bulky on purpose, because their job is shock absorption. They're usually made from a single layer of EVA foam, moulded to cushion a hard, unpredictable knock. That bulk is a feature during a game and a serious liability overnight — wearing a sports mouthguard to sleep is uncomfortable, restricts normal jaw movement, and simply isn't designed for hours of continuous wear.
Night Guards for Grinding
A night guard is thinner, more precisely fitted, and built to handle sustained, repetitive pressure rather than one sharp impact. Depending on how severely you grind, it's made from a soft, cushioning material, a rigid acrylic, or a mixed combination of both. It's shaped to sit comfortably for eight hours a night, every night, without restricting your breathing or your jaw's normal resting position.
Can One Guard Do Both Jobs?
Not well. A sports mouthguard won't hold up to nightly grinding — the material isn't designed for that kind of repeated wear, and it'll degrade fast. A night guard, in turn, isn't rated for sudden high-impact hits, so wearing one during contact sport doesn't give you real protection. If you both play a contact sport and grind your teeth at night, you genuinely need two separate appliances, each doing the job it was built for.
Frequently Asked Questions
Can I use my sports mouthguard as a night guard?
Not recommended. Sports mouthguards are bulky and designed for one-off impact absorption, not hours of sustained grinding pressure. They're uncomfortable to sleep in and won't hold up to nightly wear the way a purpose-built night guard will.
Can I use a night guard while playing sport?
No. A night guard isn't rated to absorb a sudden high-impact hit. If you play a contact sport, you need a proper sports mouthguard for that, separate from any night guard you use for grinding.
Is a night guard the same as a retainer?
No. A retainer holds your teeth in a fixed position after orthodontic treatment. A night guard creates a protective barrier between your upper and lower teeth to absorb grinding forces. They serve completely different purposes, even though both are custom-fitted and worn overnight.
Do I need both a mouthguard and a night guard?
If you play a contact sport and also grind your teeth at night, yes — they're built for different forces and one can't substitute for the other.
Stop Grinding. Start Protecting.
Order your custom Jawology night guard from $270 — hundreds cheaper than at the dentist. Soft, mixed or hard, all arch options.
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