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What should I do if the TrueFit™ Mouthpiece does not fit?

Updated over 2 weeks ago

If your Mouthpiece doesn’t feel right, don’t worry — let’s make sure it’s seated and positioned properly before assuming there’s an issue with the fit.


✅ First, try this:

Watch our quick video on how to insert and adjust your Mouthpiece:
🎥 Watch the how-to video

Key tips:

  • Gently place the Mouthpiece in your mouth while the device is off

  • Bite down softly — enough to hold it in place, not to squeeze it

  • Wiggle your jaw slightly to ensure bristles make contact with all your teeth


⚠️ Still not fitting comfortably?

If the Mouthpiece:

  • Feels too large or small

  • Won’t sit evenly

  • Causes discomfort during use

Please stop using the device and contact us at support@feno.co. We’ll help troubleshoot!

Your comfort (and smile) matters to us.

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