Yes! The TrueFit™ Mouthpiece was designed with comfort as a priority. The ultra-soft bristles are gentle on teeth and gums and are fused to a semi-pliable plate that adjusts to your unique dental arch. We offer 6 Mouthpiece sizes to fit 90%+ of dental arches; after purchasing the Feno Smartbrush, you’ll use our custom FitKit app to measure your dental arch on your phone to help us find the right Mouthpiece size for you.