How to Choose a Mouthguard for MMA and Boxing

A mouthguard is the cheapest insurance policy in combat sports. It costs between $10 and $100 and protects against the one injury you can't train through — dental trauma.

But walk into any fight store and you'll find three types at wildly different price points. Here's what actually matters.

The Three Types of Mouthguard

1. Stock (Pre-Formed) — $5–$20

Off-the-shelf, one-size-fits-most. You unwrap it and wear it.

Pros: Cheap. Available everywhere. Better than nothing.

Cons: Bulky. Poor fit. Hard to breathe and talk through. Minimal protection because it doesn't conform to your teeth. Falls out easily.

Verdict: Fine for a one-off session. Not for regular training. If you're training weekly, skip this category entirely.

2. Boil-and-Bite — $15–$50

The standard for most fighters. You boil it in water, let it cool briefly, then bite down to mould it to your teeth.

Pros: Custom fit at a reasonable price. Much better protection than stock guards. Available in single and dual-layer options. Replacement cost is low.

Cons: Fit quality depends entirely on how well you mould it. Easy to mess up the first time. Thinner than custom guards. Replace every 6–12 months depending on use.

Verdict: The right choice for 90% of people reading this. Get a dual-layer boil-and-bite from a reputable brand and spend 5 minutes moulding it properly.

3. Custom-Fitted (Dental) — $100–$300+

Made by a dentist from an impression of your teeth.

Pros: Perfect fit. Best protection. Thinnest profile — easiest to breathe and communicate through. Lasts 2–3 years with proper care.

Cons: Expensive. Takes 1–2 weeks to make. If you lose it, you're out $200+. Overkill for casual training.

Verdict: Worth it if you compete regularly or have existing dental work (crowns, bridges, implants). For recreational training, a quality boil-and-bite is sufficient.

Single vs Double (Upper Only vs Upper + Lower)

Single (upper only): The standard for boxing, Muay Thai, and most striking sports. Protects the upper teeth. Your lower teeth and jaw are protected by keeping your mouth closed behind the guard.

Double (upper + lower): Covers both sets of teeth. Popular in MMA because impacts can come from unexpected angles during grappling and ground-and-pound. Also useful if you have braces on both arches.

For MMA specifically: a double guard provides extra protection during scrambles and ground exchanges. The tradeoff is it's harder to breathe and communicate. Many MMA fighters use a single upper guard for training and a double for hard sparring.

For pure striking (boxing, Muay Thai, kickboxing): single upper is the default.

What to Look for in a Boil-and-Bite Mouthguard

Dual-layer construction — A hard outer shell (absorbs impact) with a soft inner layer (comfort and custom fit). Single-layer guards are barely better than stock.

Breathe channels — Small openings in the front that let air pass through when your jaw is clenched. Critical for MMA where you're breathing heavy during grappling exchanges.

Gel-fit liner — The inner gel layer redistributes to fill gaps during moulding. The difference between a guard that stays in during a full round and one that doesn't.

Antimicrobial — Mouthguards live in a dark, warm, wet environment. If it's not antimicrobial, it's going to smell. Replace non-antimicrobial guards every 6 months regardless of wear.

Case included — A ventilated case prevents bacteria build-up between sessions. If your guard doesn't come with one, buy one separately.

How to Mould a Boil-and-Bite Properly

Most people rush this and end up with a loose fit. Here's the correct process:

1. Boil water. Deep enough to fully submerge the guard. Rolling boil.
2. Submerge the guard. Use tongs or a spoon — not your fingers. Most guards need 30–60 seconds. Follow the brand's specific timing.
3. Remove and cool for 5–10 seconds. You want it hot but not scalding. If it burns your lip, it's too hot — wait longer.
4. Bite down firmly. Not gently — bite like you're clenching during a round. Press the guard against your teeth with your fingers from the outside while biting.
5. Suck in. Create suction by sucking air and water through the guard while biting. This pulls the inner layer tight against your teeth.
6. Hold for 30–60 seconds. Don't move your jaw. Don't talk. Just bite and hold.
7. Cool in cold water. Submerge the guard in cold water to set the shape.
8. Test the fit. It should stay in place without you biting down. If it falls out when you open your mouth, re-mould it.

If you mess it up: Most boil-and-bite guards can be re-moulded 2–3 times. Re-boil and try again.

Care and Replacement

• Rinse after every session. Cold water only — hot water deforms the guard.
• Brush gently with a toothbrush weekly. No toothpaste (abrasive). Just water and a soft brush.
• Store dry in a ventilated case. A sealed case traps moisture and breeds bacteria.
• Replace every 6–12 months. Even with good care, the material degrades. If the guard feels loose, has visible cracks, or smells after cleaning — it's time.
• Replace immediately if you've had dental work. Your teeth have changed shape. The old guard no longer fits correctly.

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