What's your favorite mouthpiece?

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I'v been diving with just the generic mouthpiece that comes with my regulator, but I had a fairly intensive dive weekend and I wound up with a weird blister on my gums. I had no idea that was even possible and never had it happen before, but here we are. Also, I'm not really sure if it came from the mouthpiece but it's the only explanation I've got. So I've got another intensive dive weekend coming up and I want to switch out.

What's your favorite?

From what I gather mouthpieces breakdown into...

1. Moldable.
2. The type with ridge in the roof of your mouth.
3. Bigger cushier ones
4. basic
5. or maybe you don't care and whatever delivers air is fine.
Apeks Comfobite is good.
 
Seconded on the preference thing. It comes down to your mouth shape and your overall bite profile.

For me, the 'Long-bite' ones are perfect. They just fit my bite profile perfectly, and on a rebreather I can have the loop mouthpiece basically rest against my upper teeth during a dive and use 0 bite force to keep it in my mouth. Other people hate them because they extend so far back they are contacting gums/behind their teeth. One friend of mine with a Dive Rite reg set wound up with cold sores thanks to that during a dive trip and had to cut their mouthpieces till they got replacements of a different type.

I've tried the Comfobite style and the bridge just didn't fit my mouth at all. It felt like there was no space at all for my lips to seal. Any movement of my mouth or lips would let water in.
I got a Dive Rite reg for my stage bottle and I had that experience too. Not to the point of cold sores, mind, but the mouthpiece extends back far enough to make gas switches harder than they need to be. Def preference for Apeks comfobite style.
 
Has anyone used those soft silicone comfos that don't hold their shape and slip out of your mouth like jelly
 
Apeks comfobite hands down. It will handle all my underwater lockjaw. It does get grimy after a while, but hey don't all mouthpieces
 
I don't know if I have a preference. I've generally just used whatever came with the regulator until it tore then replaced it with whatever I had in my spares kit. I always liked the ones on Poseidon Cyklones but I'm not sure they fit most regs as they are quite big. Apeks comfo bite mouthpieces are pretty good.

I have a real dislike of the mouldable mouthpieces. I really struggled getting these to seal on the post of my KISS mouthpiece. And if you are going to use one on a rebreather then double check you have the high flow version, I learned the hard way (minor CO2 hit at 10m) and it makes a huge difference. I'm not keen on them on OC either for primary donate. Having something big and hard shoved in your mouth that you really weren't expecting doesn't generally go down well.

The absolute worst mouthpieces I've ever used were those Manta Bite things. They seemed like a great idea for CCR diving for countering the weight of the BOV and the flaps at least gave some nominal sealing with a slack jaw. But the edges of the flaps absolutely shredded my mouth. It took a lot of time and pain to get it adjusted properly and just wasn't worth the effort. There was always a hot-spot somewhere in my mouth and eventually just got sick of it. I vaguely remember bailing to OC at deco because I was in so much pain from it that I didn't think I could tolerate another hour sitting at 6m.
 
With the off-the-shelf mouthpieces, my jaw locks up sometimes, which is uncomfortable to say the least. The comfo-bite mouthpieces mostly (90%) resolve the issue.
 

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