If you’ve ever finished a dive with an aching jaw or sore gums, you’re not alone. Many divers accept mouth fatigue as “part of the sport”, but it doesn’t have to be. The Mares JAX Mouthpiece changes that — offering a tailor-made fit that feels as natural as breathing itself. It’s one of those small upgrades that makes a big difference underwater.
What Is the Mares JAX Mouthpiece?
The Mares JAX is a custom-mouldable regulator mouthpiece designed to perfectly fit your unique bite. Unlike standard silicone mouthpieces, which use a generic shape, the JAX can be thermoformed — meaning you soften it in warm water and bite down to create a precise, personal fit.
This simple process only takes a few minutes but results in a mouthpiece that feels made for you. Once moulded, the JAX keeps its shape dive after dive, ensuring long-lasting comfort and a secure fit, even on longer or deeper dives.
Key Features and Benefits
| Feature | Benefit |
|---|---|
| Custom mouldable design | Creates a mouthpiece perfectly fitted to your bite for ultimate comfort. |
| Boil-and-bite process | Easy DIY fitting using hot water — no need for special tools. |
| Compatible with most regulators | Fits all Mares regulators and most standard regulator models from other brands. |
| Soft yet durable silicone | Gentle on the jaw while maintaining shape and strength. |
| Reduces jaw fatigue and stress | Perfect for longer dives, cold water conditions, and those prone to tension. |
| Secure fit | Minimises the risk of slipping or leaks during dives. |
| Available in multiple colours | Personalise your gear and easily identify your own regulator. |
With the JAX, you’re not just improving comfort — you’re enhancing safety and enjoyment underwater. A secure, custom fit means you can relax your jaw and focus entirely on the dive, not the regulator in your mouth.
Who It’s For
The Mares JAX Mouthpiece is ideal for:
- Recreational and technical divers who experience jaw fatigue or gum soreness.
- Cold-water divers who tend to clench due to low temperatures.
- Underwater photographers or instructors who spend long periods submerged.
- Anyone who values comfort, fit, and control during every dive.
If you’ve ever found your standard mouthpiece uncomfortable or unreliable, this upgrade is for you.
Trusted by Divers Worldwide
Across dive forums, review sites, and social media, the Mares JAX consistently receives glowing feedback. Divers praise its “life-changing comfort” and note how much more relaxed they feel underwater after switching to a JAX. Many report they’ll never go back to a standard mouthpiece again.
“I didn’t realise how much tension I was holding in my jaw until I used the JAX. Total game-changer for longer dives.”
"I have several of the Mares Jax mouthpieces and can't think of a bad thing to say about them. Possibly the best comfort per dollar purchase I have made with regard to dive gear."
That’s why it’s a favourite among dive instructors and seasoned pros who log hundreds of dives every year.
Comparison Chart: JAX vs. Standard and Comfy Mouthpieces
| Feature | Standard Mouthpiece | Comfy Mouthpiece | Mares JAX Mouthpiece |
|---|---|---|---|
| Fit | Simple, generic, symmetrical bite tabs; inexpensive and functional, but not particularly ergonomic. | Curved bridge or palate section connecting the bite tabs, designed to distribute pressure evenly across the teeth and gums. | Custom-mouldable bite that conforms to your exact dental shape. |
| Comfort Level | Basic | Moderate | Exceptional – feels made for you. |
| Jaw Fatigue Reduction | Minimal | Some | Significant reduction |
| Durability | Average | Good | Excellent – holds shape for years. |
| Installation | Simple | Simple | Simple |
FAQ
Q: How do I fit the Mares JAX mouthpiece?
A: Simply immerse JAX in boiling water for a few seconds and then clamp it between your teeth to achieve a perfectly stable mouthpiece that will ensure perfect comfort.
Q: Does it fit all brands of regulators?
A: The JAX fits all Mares regulators as well as most standard regulators from other brands.
Q: What makes the Mares JAX different from a standard or comfy mouthpiece?
A: Unlike standard silicone mouthpieces, the Mares JAX is custom-mouldable. Once softened in warm water, it shapes perfectly to your teeth and bite pattern — giving you a personalised fit that reduces jaw fatigue and improves comfort on long dives.
Q: Will the JAX make it harder to share air in an emergency?
A: Not at all. The JAX stays firmly attached to your second stage, just like any standard mouthpiece. In an air-sharing situation, the regulator can still be passed to a buddy if necessary — the custom bite simply improves your own comfort during regular use.
Final Thoughts: The Future of Personalised Dive Gear
As diving equipment becomes increasingly tailored to individual needs, the Mares JAX Mouthpiece represents a step forward in custom comfort and performance. It’s a small piece of kit that has a massive impact on your diving experience — proof that sometimes, it’s the details that make the biggest difference.
So next time you gear up, make sure your regulator feels like it was made just for you — because with the Mares JAX, it truly is.
Ready to experience the comfort of a perfectly fitted regulator?
👉 Upgrade to the Mares JAX Custom Mouthpiece today and say goodbye to jaw fatigue for good. Once you’ve tried it, you’ll wonder how you ever dived without it.
