Feno Smartbrush Founders Edition Bundle Review: The 20-Second Toothbrush Gunning for Your Dentist’s Job

If you’re someone who’s ever stood in front of your bathroom mirror, half-asleep, robotically brushing your teeth after mentally (mis)calculating how many times you could hit snooze and still make it to work — this smartbrush is for you. The Feno Smartbrush isn’t just another electric toothbrush or even just a smart toothbrush; it is a full-mouth, AI-powered, oral-health-summarizing, plaque-busting mini dental clinic in the palm of your hand. I’ve been testing the Feno Smartbrush Founders Edition Bundle to see if it’s worth the hype (and the price tag). Spoiler: There’s a lot to talk about.

What Even Is This Thing?

At first glance, the Feno Smartbrush looks like the love child between a futuristic power tool and an oversized sports mouthguard. The U-shaped mouthpiece slots over your top and bottom teeth simultaneously, and it connects to the chunky yet sleek Smarthandle — the brains of the operation. It vibrates. It scans. It tracks. It talks to your app. It even tattles on you if you’re slacking on your dental routine.

This isn’t just about a surface-level clean, though. Feno is marketing this thing as a preventive health tool. The idea is that your oral health is a window into your broader health — and the app helps you monitor that in near real-time. So yeah, it’s brushing with ambition.

The FitKit Process: Because One Size Fits Nobody

After purchasing your Feno Smartbrush and before you receive your package, you’ll use Feno’s FitKit app to snap a few selfies of your mouth. Their AI analyzes the shape of your dental arch and matches you with one of six available TrueFit Mouthpiece sizes. This might sound tedious, but it’s critical—most similar products use a single, generic mouthpiece, which usually fits like a rubber shoe on a brick.

The FitKit process was simple and took about five minutes. The Feno Smartbrush Founders Edition Bundle arrived in about a week or so.

What’s in the Box?

Unboxing the Feno Smartbrush Founders Edition Bundle feels like you’ve just joined an elite dental cult — in a good way. You get the Smartbrush, a magnetic SnapCharger, the TrueFit Mouthpiece that’s been custom-sized to your teeth, three tubes of their wild mint-flavored XyFoam toothpaste, a tongue scraper, and one month of access to the Feno Plus app.

The packaging is modern, minimal, and refreshingly unclinical. Everything feels premium and well thought out, from how the accessories are arranged to the helpful setup guide inside the lid.

Let’s Talk Design and Materials

The Smarthandle is solid. Think medical-grade plastic meets industrial design, with enough heft to feel expensive but not so much that it’s awkward. It’s IP64-rated, which means it can handle splashes but isn’t waterproof enough for shower use.

On the front, an approximately 1.25″ round display shows the time and a greeting determined by the time of day. There’s also an LED flash, a camera, and an LED indicator.

The right side of the Feno Smartbrush has two buttons: the top button activates the oral scan after a brushing session, and the bottom button wakes the brush.

A large, single button on the left side starts or pauses the Smartbrush. The back is plain, and it is where the magnetic charger snaps.

The SnapCharger is magnetic and clicks into place on the back of the Smarthandle from either direction, but I’ve had better luck ensuring that the charging is properly happening when the cable on the SnapCharger is turned down toward the bottom of the Smartbrush handle.

The TrueFit Mouthpiece is flexible and lined with 18,000 ultra-soft nylon bristles — not silicone like some cheaper alternatives. That makes a big difference. You can actually feel the bristles making contact instead of just tickling your teeth and pretending to do something.

The Smarthandle’s battery life lasts about a week on a full charge, so it’s travel-friendly in that regard, but what’s missing is some kind of case to keep it in.

At some point, Feno offered an accessory called a Hub that worked as a charger and a travel case, but that doesn’t appear to be an option anymore.

I contacted Feno about the Hub’s lack of availability; they told me that they are “working on making new improvements to the Hub, which is currently on backorder and slated to start delivering it in Q2/Q3 2025.” So that good news.

In the meantime, I use a quart-sized silicone baggie to keep the brush and mouthpiece clean while traveling. It’s not exactly an ideal solution, but it works.

So, How Do You Use It?

Here’s what it’s like to brush your teeth with a mouthguard that doubles as your personal dental assistant.

First, you’ll run the U-shaped, bristled mouthpiece under tap water, then you’ll load it with a thin layer of Feno’s XyFoam (two pumps on each side), fit it into your mouth, rest your teeth in the channel (without biting down), and hit the large round start button on the left side of the Smartbrush.

Full disclosure: This process was pretty awkward the first few times I did it, mostly because the mouthpiece is wider than you might expect.

The brush runs for 20 seconds — or 30 if you extend the timer through the app as I did — and all your teeth get brushed at once. While running, you’re supposed to move the Feno Smartbrush slowly in small circles to ensure that the bristles make contact with your teeth and gums. You don’t want to bite down; just keep your mouth relaxed and let the Smartbrush do its thing.

At first, it’s a weird feeling. Imagine your entire lower face vibrating — like a tiny jackhammer just massaging your molars. There might be a learning curve, but it’s short. After a couple of days, it starts to feel like second nature.

@fenolabs Yes, the Feno Smartbrush brushes weird—because protecting your whole-body health required rethinking traditional brushing. Our smart toothbrush delivers complete coverage in 20 seconds while monitoring oral health signs linked to heart disease, diabetes, cognitive health, and more. #feno #smartbrush #smarttoothbrush #futuretech #healthtech #oralhealth #fenolabs #fenotoothbrush #utoothbrush ? original sound – Feno Labs

When you’re done, the display will say, “Good job.” You just run the U-shaped, bristled mouthpiece under water again, and then shake the Feno Smartbrush a few times to dislodge any water.

Since you can’t brush your tongue with the Feno Smartbrush, the Founder’s Bundle includes a U-shaped tongue scraper that you can pull across your tongue five to ten times to make sure it’s squeaky clean, too.

Next, you can take an optional dental scan by positioning the Smarthandle about 10″ away from your mouth and opening it wide. Pressing the top button on the right side of the Feno activates the scan, and a blue light will come on to tell you that the camera is activating.

When the scan is done, a close-up image of your open mouth—teeth, tongue, and all—appears on the display.

You can take multiple scans at a time to get better angles of your mouth, and Feno will send you periodic emails containing a link you can click for a Personalized Oral Health Report.

Feno notes that:

With more scans over time, your report will continue to improve, providing you with increasingly accurate and personalized insights. We hope this report helps you understand your oral health better and guides you towards maintaining a bright and healthy smile.

You can peruse the full user manual by clicking here.

Regarding replacement supplies, the TrueFit Mouthpiece lasts for approximately 200 brushes or a little over three months if you brush twice a day; refills can be ordered directly from Feno for $51 or $27 with a Feno account. A three-month supply of XyFoam sells for $49, but you can get it for $29 with a Feno account.

What About the Clean?

I’ve used everything from manual toothbrushes to “better” manual toothbrushes to various electric toothbrushes at all price points, and the Feno Smartbrush honestly delivers.

After a 30-second cycle, my teeth felt noticeably smoother—the kind of clean you usually get after a dental visit—without the scraping or guilt-inducing floss lecture. You still need to floss, though!

Feno claims its brush delivers 250 strokes per tooth. I can’t confirm that, but I can tell you that the sensation is intense—in a good way. You’ll feel it in your cheeks, gums, and, if you’re super sensitive, maybe even your sinuses.

I found it shocking that the Feno Smartbrush could make my teeth feel so clean in such a relatively short time!

What Makes Feno Different from Other Smart Brushes?

Compared to electric toothbrushes like the Oral-B iO series, Sonicare, and Laifen Wave, which are also smart and app-connected, Feno takes oral care a few steps further.

This isn’t just about brushing technique or brushing time. Feno actually scans your mouth and sends that data to real dental professionals via the app. You get personalized reports, feedback, and — if you want — ongoing guidance through the Feno Plus subscription, which costs $9.95 per month after the initial free month if you opt in.

@fenolabs Transform your 2-minute brush into a 20-second revolution. The Feno Smartbrush’s 18,000 bristles deliver complete coverage while AI-powered scanning tracks your oral health in real-time. Stay ahead of issues before they start, connect directly with an oral health coach, and protect more than just your smile. The future of oral care is here – and it’s just 20 seconds away. #feno #smartbrush #smarttoothbrush #futuretech #healthtech #oralhealth ? original sound – Feno Labs

None of the other brushes I’ve tested offer this level of analysis, and certainly not with a custom-fit mouthpiece that actually speeds up brushing.

Those other electric toothbrushes are good, don’t get me wrong, but just like manual brushes, they still expect you to put in a full two minutes each time you brush your teeth.

Getting the same cleaning in just 20 to 30 seconds is great for someone like me who finds it tedious to spend two minutes at the sink, consciously ensuring that each quadrant of my mouth has been properly brushed.

Let’s Talk About XyFoam

This isn’t the gritty drugstore paste many of us have settled for; XyFoam is a xylitol-based foaming toothpaste with a clean mint flavor. The foam spreads evenly through the mouthpiece, reaches your gumline, and rinses away without leaving gunk in your sink or your mouth.

It’s gentle on enamel, and it doesn’t sting. I like the taste and consistency of XyFoam. That said, it’s worth noting that XyFoam doesn’t contain fluoride.

To answer that concern, Feno states:

XyFoam doesn’t use fluoride because it relies on xylitol, a natural sweetener, to support enamel, boost gum health, and naturally whiten teeth, effectively providing key oral health benefits traditionally offered by fluoride.

You can still use your favorite traditional toothpaste with the Feno Smartbrush, but the XyFoam perfectly complements the brush’s design and function.

The first thing that I noticed after using the Feno Smartbrush was that the XyFoam left my mouth feeling fresher than my usual Arm & Hammer toothpaste and TheraBrush mouthwash combo. When I spit into the sink after brushing, it washed away cleanly without me needing to wipe up any remaining white gunk from the basin. It’s the little things.

The App: More Than Just a Timer

Feno’s app is refreshingly simple, maybe a little too simple if you like data overload, but it gets the job done. It tracks your brushing streaks, monitors your scanning cadence, and provides bi-weekly oral health reports if you use the scanner at least a few times a week. The reports break down plaque levels, inflammation, and even tongue health, which — let’s be honest — is usually ignored until something starts hurting.

The app will tell you the remaining charge on your smartbrush and show your weekly brushing streak.

It will also show your weekly scanning streak.

In the app settings, you can choose a 20- or 30-second brushing duration and adjust your brushing speed from low to high; you can also disable or set the bite sensitivity from low to high.

Pro Tip: If the mouthpiece’s action initially feels too intense or your gums bleed slightly, try starting on the lowest vibration setting. Your gums will thank you.

Who Is This For?

You know me; I have no issues with TMI or embarrassing stories, so if you enjoy those, today is your lucky day!

In the 1990s, when I still used a traditional toothbrush, my dentist pointed out that he could tell that I was overbrushing my teeth on the upper left side of my mouth because my gums were beginning to recede, with the risk of my tooth’s root eventually becoming exposed. He said if I didn’t stop doing that, I would have problems like heat and cold sensitivity, never mind that it would make my smile a bit less “pretty.”

No, thank you!

I tried to be much more mindful of my overbrushing, but it still happened. Even though I was using a brush with the softest available bristles, I was still pressing too hard—particularly in that one gum area, and now I had to deal with the repercussions; it was recommended that I have a connective tissue graft surgery (yikes!!).

To do the connected tissue graft, my oral surgeon had to remove a strip of healthy gum from the top of my mouth and transplant it to the affected gum area. The graft healed beautifully, but let me tell you, the procedure and the healing process were not fun at all. My tongue could not stop messing with the tiny stitches in the roof of my mouth, and even though they had prescribed pain killers, everything just hurt!

After the graft had fully healed, I was recommended to use an electric toothbrush and “let it do the work for me.” But even with an electric toothbrush, I often pressed too hard in certain areas

As electric toothbrush technology advanced and they started incorporating lights and other feedback into the handles that would alert me when pressing too hard, it was still a constant struggle to keep my mind on the task and not do it.

With the Feno Smartbrush, overbrushing hasn’t been an issue at all. I think it’s a combination of being able to brush my entire mouth simultaneously without focussing on a single area and the fact that I can really focus on the task at hand when it only lasts for 30 seconds seems to be working. Even with Feno’s bite sensitivity set on high, I haven’t received any warnings.

All that to say, if you’re someone who hates brushing, rushes through it, or has a bad track record with the dentist, the Feno Smartbrush might be the perfect toothbrush for you. It’s also ideal for people with limited dexterity, those who tend to over-brush (like me!), or anyone juggling a hectic schedule. Parents of teens, tech lovers, wellness junkies — this scratches a lot of itches.

If you’ve had crowns, dental implants, or sensitive teeth, Feno recommends double-checking with your dentist before using the Smartbrush, but it is worth pointing out that the soft nylon bristles are gentle, and the app lets you customize the intensity.

However, it’s not recommended for those with braces yet, but Feno states that they are looking “to optimize the brushing experience for those with braces in the near future,” so hopefully, that’s coming.

Downsides? Let’s Be Honest

Yes, it’s pricey, but it’s new tech, and I consider it the early-adopter tax. Yes, the mouthpiece feels weird and a bit bulky at first, but you’ll get used to it quickly. And yes, it’s still early days for Feno’s larger vision of personalized teledentistry, but what’s available already can be very helpful. I look at Feno as an investment in a daily health tool that turns a tiny chore into a fast, futuristic routine.

Perhaps my biggest complaint is that there isn’t a travel case for it. And while the scanner and app are innovative, there’s room to expand — maybe with even more tutorials or more granular data visualizations. But as a first-gen release, it’s incredibly well thought-out.

Quirks aside, there’s no denying the sheer convenience and comfort of having this much oral care packed into such a compact system.

Final Thoughts

The Feno Smartbrush Founders Edition Bundle isn’t just trying to replace your toothbrush. It’s rethinking the way you brush — and how you approach dental care altogether. For the skeptics: I get it. I was one. But after almost two months of using this thing, I’m hooked. It’s faster, easier, and — dare I say it — kind of fun.

If the idea of shaving up to 100 seconds off your morning routine while getting better results appeals to you, and if you’ve been waiting for a toothbrush that actually pulls its weight, the Feno Smartbrush might just be the upgrade you didn’t know you needed.

The Feno Smartbrush Founders Edition Bundle retails for $299; it is available directly from the manufacturer.

Source: Manufacturer supplied review sample

What I Like: Custom-sized mouthpiece fits comfortably and cleans effectively; Full-mouth brushing in 20–30 seconds saves time without compromising results; Teeth feel dentist-clean after each use; The built-in scanner and app provide helpful health insights; The XyFoam tastes great, rinses clean, and feels gentle; The app is easy to navigate with customizable brushing settings; The Bite Sensitivity setting helps prevent overbrushing; The SnapCharger is convenient, and the battery lasts about a week; The Smartbrush has a sleek design; Great for busy people, over-brushers, or those with limited dexterity

What Needs Improvement: No travel case is included, nor do they offer one as an optional accessory, but an improved Hub (charging and travel case) should be coming later this year; The mouthpiece feels bulky at first and takes getting used to; The high price may deter first-time buyers; It is not yet compatible with braces; The lack of fluoride in XyFoam may be a concern for some