Founder's Edition Bundle

The Feno Smartbrush is a radical step forward for oral health. The average toothbrush has 2,500 bristles; the Feno Smartbrush has an average of 18,000. The average toothbrush brushes each tooth one at a time; the Feno Smartbrush brushes all teeth simultaneously. The average brush cycle takes 120 seconds; the Feno Smartbrush takes 20. The Feno Smartbrush is also the first brush that takes deep scans of your teeth and gums to provide ongoing insights into the condition of your oral health. An astonishing 90% of individuals suffer from some form of gum disease, an oversight we aim to correct with the Feno Smartbrush, designed as the product to bridge oral health and overall health.

The Feno® Smartbrush is designed to be user-friendly and requires minimal technique for effective use. While the advanced technology, including the TrueFit™ Mouthpiece and ArcFlow Tech™, ensures comprehensive cleaning, users should still follow a simple technique for optimal results. While the Smartbrush is on, it is recommended to move the TrueFit™ Mouthpiece in a slow circular motion. This motion helps to achieve optimal bristle contact with all areas of the teeth and gums, enhancing the brushing results.

The Feno app makes personalized oral care simple. Use the app to capture images of your mouth, including your gumline, tooth surfaces, and tongue. Each scan syncs automatically to your Feno app profile, where you'll see any potential areas of concern and can track changes over time. Have a question about your results? Just ask our AI chatbot, built right into the app, for instant answers.

Yes. The brush is fully functional on its own. The app just adds to it: tracking, coaching, and insights that help you get more out of every session over time.

Feno is a personalized-fit, motorized, sensor-equipped device that brushes your whole mouth in seconds. There are two consumables to plan for: Feno Foam, and a fresh TrueFit Mouthpiece we recommend changing every three months. Everything's listed upfront, so you always know what to expect.

You can use any toothpaste you like. That said, Feno Foam is built for the mouthpiece, it spreads evenly across all 18,000 bristles at once, so every tooth gets the same coverage in that 20-second clean. Toothpaste works; foam just works better with how Feno brushes.

Feno doesn't ship one universal size. Based on your mouth scan, we match you to the right TrueFit Mouthpiece from our seven sizes, a personalized fit, not a one-size tray (which is exactly why older U-shaped brushes failed). If it doesn't feel right at first, it's often just seating: place it in gently with the device off, bite down softly, and wiggle your jaw so the bristles reach every tooth. Still not comfortable? Reach out to support and we'll resize you. Your first two size exchanges are free.

No. Feno Plus is optional and you can cancel anytime from your account. You can also buy refills of Feno Foam one off whenever you need them.

Every order is covered by our money-back guarantee: you have 30 days from delivery to return it. For US orders we provide the return label; outside the US, return shipping is covered by you. Just reach out to support and we'll walk you through it. And because your first two size exchanges are free, an imperfect first fit never costs you anything.

Feno isn't the right fit for everyone. We don't recommend it for anyone under 18, anyone with active braces, anyone with a crown placed within the last 4 weeks, or anyone with a pacemaker. If any of these apply to you, we'd suggest checking with your dentist before ordering.

Yes. When we size your TrueFit Mouthpiece, your FitKit scan captures your teeth from front to back, so every tooth—including your back molars—is accounted for when determining your fit. That means your mouthpiece is sized to provide coverage across your full dental arch, not just your front teeth. Just bite down gently and use slow, circular motions to help the bristles maintain contact as the Feno Smartbrush cleans.

Yes, same as with any toothbrush. Feno cleans the front, back, and top of every tooth. Floss cleans between them. Keep flossing once a day.

Feno uses 18,000 ultrasoft nylon bristles. Nylon is the same material found in most toothbrushes. The bristles are gentle on your gums and built to hold their shape. Like any toothbrush, they wear down over time, so swap your brush head every six months to keep them working their best.

7-day Battery. Designed for portability and travel, the Smarthandle stays charged for an entire week.

Every Feno comes with a tongue scraper. Use it after you brush. It takes a few seconds and clears the film that a toothbrush head can't reach. In a clinical study, tongue scrapers beat toothbrushes at fighting bad breath, 75% to 45%.*

*Pedrazzi et al., Journal of Periodontology, 2004

The Feno Smartbrush is designed to be gentle on your gums. We recommend starting at the lowest intensity and using gentle, circular motions without applying excessive pressure. If you already have gum recession, gum sensitivity, or another existing gum condition, check with your dentist before using Feno to make sure it’s appropriate for your specific needs.