CUSTMBITE Rest in Peace Night Guard Review – Does the 2-Pack Live Up to Its Claims?

Quick Verdict

The CUSTMBITE Rest in Peace Night Guard is a solid over-the-counter option for anyone dealing with mild to moderate teeth grinding or clenching. The 2-minute microwave fitting actually works, the BPA-free material feels durable enough for nightly use, and the two-pack bundle solves the problem of never having a clean guard handy. It's not a replacement for a dentist-fabricated appliance — if you have severe bruxism or dental work, skip this and see a pro — but for the price, it's one of the more comfortable OTC guards I've tested. I'd give it a Rest in Peace Night Guard score of 4.2 out of 5.

What Is the CUSTMBITE Rest in Peace Night Guard?

Let's get one thing straight straight away: this is a boil-and-bite style mouth guard, not a prescription device. The CUSTMBITE Rest in Peace Night Guard comes as a pack of two clear, mouldable guards designed to protect your teeth from the damage caused by bruxism — that's the clinical term for unconscious teeth grinding and jaw clenching during sleep. The brand's name, and the product's, take a darkly playful angle on the problem: if your teeth aren't resting in peace, this guard is meant to give them a fighting chance.

What sets it apart from the generic pharmacy shelf options is the fitting method. Instead of the traditional boil-in-water approach, you nuke it in the microwave for two minutes. The patented material softens enough to take an impression of your teeth when you bite down. The whole process — warm, shape, cool, wear — takes less than five minutes, which is genuinely convenient if you've ever wrestled with a pot of boiling water trying to fit a sports mouth guard.

Key Features

• Microwave fitting in 2 minutes — no stove or boiling water needed
• Pack of two guards so you always have a clean spare
• BPA-free and phthalates-free material
• Ventilated storage case included
• Customisable fit: re-mould as many times as needed
• Patented material designed for long-term nightly use
• Transparent and lightweight enough to wear on either the upper or lower arch

Hands-On Review

I fitted both guards on a Tuesday evening — one for the upper arch, one for the lower, just to test the versatility. The instructions say two minutes in the microwave, then bite down for 30 seconds. What I noticed right away was the material doesn't get droopy the way standard EVA mouth guard material does after heating. It holds its shape while you're working with it, which made the fitting step feel less rushed.

The first night I wore it, I woke up and genuinely couldn't remember if I'd ground my teeth at all — which, honestly, is the goal. The guard sits slightly proud of the teeth surface, adding maybe 2–3 mm of thickness. That takes a night or two to stop noticing. By night three it was just there, doing its job, which is exactly what you want.

Here's the thing nobody puts in the product listing: the thickness of this material means if you're a mouth-breather or you produce less saliva at night, the guard can feel a little dry against your inner lips. Nothing painful, just something to be aware of. Rinsing it under warm water before fitting rehydrates the surface and helps. I've used other guards where the material absorbed odour over a couple of weeks — so far, after a month with the Rest in Peace guards, that hasn't been an issue. The ventilated case makes a real difference here.

What surprised me was the refit process. On my second guard, I wasn't entirely happy with the initial impression — the back molar on one side didn't seat perfectly. I ran it through the microwave again and re-bite. It took, cleanly, which was a relief. Some boil-and-bite guards lose their mouldability after the first attempt. This one didn't.

Who Should Buy It?

Here's my honest breakdown of who this guard is for — and who should look elsewhere.

Good fit: Adults with mild to moderate teeth grinding who want a reliable OTC solution without a dentist appointment. The two-pack is particularly practical for people who travel frequently — one guard stays in the travel case, one stays at home. If you've been using a thin, one-size-fits-none pharmacy guard and it's been sliding around all night, you'll notice the difference immediately.

Also worth considering: Anyone who's had a dentist-made guard in the past and wants a backup on hand. The CUSTMBITE guards make decent insurance against the day your primary guard cracks or needs replacing.

Skip this if: You've been diagnosed with severe bruxism, you have crowns, bridges, implants, or you're wearing braces — you need a professionally fabricated device. OTC guards can't provide the precise occlusal alignment that complex dental situations require. Also skip if you have a strong gag reflex that makes wearing any intraoral device genuinely intolerable.

Alternatives Worth Considering

If you're weighing options, here are two alternatives worth knowing about:

Sentinel Comfort Dental Mouth Guard — Uses the traditional boil-and-bite method with a slightly thinner, more flexible material. Better if you're very sensitive to thickness, but the fitting process is more fiddly and it doesn't come with a storage case.

Ora危害 Dental Guard 2-Pack — Another microwave-fitting OTC option, but with a slightly different material composition. It scores similarly on comfort and durability. The deciding factor between the two often comes down to current pricing on Amazon and whether the CUSTMBITE's two-pack deal is running.

FAQ

Final Verdict

The CUSTMBITE Rest in Peace Night Guard earns its place on the shortlist of worthwhile OTC bruxism solutions. The microwave fitting is genuinely faster and less messy than boiling water, the BPA-free material holds up under nightly use, and the two-pack means you're never caught without a clean guard. It's not a dental device and shouldn't be treated as one — but as a practical, affordable bridge between doing nothing and booking a $500 dentist appointment, it does exactly what it says on the tin. If your bruxism is causing morning jaw pain, worn enamel, or cracked fillings, this is a solid starting point.