Help
Frequently asked questions
Quick answers from this manual. Each answer links to the full section.
Getting started
How do I use the Feno Smartbrush?
Rinse the Mouthpiece under running water and spread a thin layer of toothpaste along both channels. We recommend Feno Foam. Insert the Mouthpiece, fitting your teeth into the grooves, and press the Main Button. While it's on, move the Mouthpiece in a slow circular motion for the best bristle contact. When the session ends, rinse the Mouthpiece and place the Snap Charger 2 on the back of the Smarthandle 2. See Brushing.
Does the Smartbrush need any technique to work well?
Very little. While it's on, move the Smartbrush in a slow circular motion. This keeps the bristles in contact with all areas of your teeth and gums.
Can I use the Feno Smartbrush without Wi-Fi?
Yes. Brushing always works, with or without a connection. To sync sessions and Scans, connect over Wi-Fi or through your phone. See Setup.
How do I know which Mouthpiece size is right for me?
Download the Feno App, log in with the email or phone number you used to order, tap FitKit Scan and follow the on-screen steps. You only need to do this once. On Android, contact support@feno.co and we'll send you a link to complete your FitKit Scan.
Brushing
Can I use regular toothpaste?
You sure can. We recommend Feno Foam for the best results and freshness, but the Mouthpiece works with regular toothpaste too. See Foam.
Does it clean back teeth and molars?
Yes. Your FitKit Scan captures your teeth from front to back, so your Mouthpiece is sized to cover your full dental arch, back molars included. Rest your teeth gently in the Mouthpiece and use slow, circular motions to keep the bristles in contact.
Do I still need to floss?
Yes, same as with any toothbrush. The Smartbrush cleans the front, back and top of every tooth, and floss cleans between them. Keep flossing once a day.
The movement feels too strong. Can I adjust it?
Yes. Press the Upper Button or Lower Button while brushing to change the speed instantly, or change it in the Feno App. If you're new to Feno or have sensitive teeth, start on a lower setting. If you see a bite warning, ease your bite; the Mouthpiece should glide, not press. If discomfort continues, contact support@feno.co.
How do I clean my tongue?
Every Smartbrush comes with a Tongue Scraper. Use it after you brush. It takes a few seconds and clears the film a toothbrush can't reach. See Tongue Scraper.
Charging
How long does a charge last?
About 4 weeks of twice-daily brushing. See Charging.
Does my Snap Charger 1st Generation work?
No. The Smarthandle 2 charges only on the Snap Charger 2.
Can the Snap Charger 2 get wet?
No. Keep the Snap Charger 2, its cable and the power adapter dry and away from sinks, tubs and showers.
Care
How do I clean the Feno Smartbrush?
After brushing, rinse the Mouthpiece and gently shake off excess water. Let it dry completely in a well-ventilated spot, then return the Smarthandle to the Snap Charger 2. See Cleaning and care.
How do I update the software?
The Smarthandle updates over Wi-Fi. When an update is available, follow the instructions on the display or in the Feno App. See Software updates.
Scans
What is a Scan?
Scans use the Smarthandle camera to capture images of your teeth for your Oral Health Report in the Feno App. See Take a Scan.
Feno Plus
Do I need a subscription to use the Smartbrush?
No. The Smartbrush works fully without a subscription. Feno Plus connects your Smarthandle to the Feno App, which turns your Scan, brushing and streak data into personalized tracking, reports and insights, with real coaches to guide your routine. Feno Plus is included when you choose Subscribe & Save, along with Feno Foam refills every 3 months and a fresh Mouthpiece every 6 months. No commitment; cancel anytime.
Does Feno Plus include automatic refills?
Not at this time. You can set up separate Mouthpiece (every 3 months) and Feno Foam refill subscriptions.
How do I cancel Feno Plus?
Email support@feno.co. If you subscribed through Apple, cancel in your iPhone's Settings: tap your name, then Subscriptions, then Feno Plus, then Cancel Subscription.
Safety
Can I use it with braces?
Not yet. The Smartbrush isn't designed to work with braces. Once your braces come off, it's an excellent way to care for your newly straightened smile.
Can I use it with dental crowns?
Permanent crowns: yes, once they've been in place for at least 4 weeks, and only on the lowest speed. Don't use it with temporary crowns or crowns less than 4 weeks old. Consult your dentist first if you have any dental restorations.
Can I use it with sensitive teeth?
Yes. Start at the slowest speed and increase gradually as you get comfortable. Feno Foam is made without harsh abrasives. If you feel any discomfort, contact support@feno.co.
Can my kids use my Feno Smartbrush?
Our Mouthpieces are designed for ages 13 and older, so please don't share your Smartbrush with your kids. We're working on a Smartbrush for Kids; join the waitlist to be first to know.
I have a pacemaker. Can I use it?
Consult your physician or the device manufacturer before use. The Snap Charger 2 contains magnets. See Safety instructions.
Help
How do I reset my Smarthandle 2?
From the home screen, press and hold all three buttons (Main, Upper and Lower) together until the countdown finishes. This erases settings, Wi-Fi, pairing and any sessions not yet synced. See Troubleshooting.
What should I do if I see an error message?
Restart: hold the Main Button for 6 seconds, then tap it to turn it back on. Check the Feno App for updates. If the message says Wi-Fi isn't connected, reconnect in the app. If it's a bite warning, ease your bite. Still stuck? Contact support@feno.co.
How do I dispose of the Smartbrush?
Follow local regulations for electronic devices and batteries. Do not put it in household trash. See Disposal.
How do you use my data?
Feno collects brushing and Scan data to give you personalized insights, like your Oral Health Report. It's stored securely, and we never share your information or brushing data. See our Privacy Policy.
Is there a warranty?
Yes. The Smarthandle 2, Snap Charger 2 and adapter come with a 1-year warranty, extended to 2 years for Feno Plus members. See Warranty.