How much does a mouthpiece cost? Jenny Flor Jiang October 15, 2018 08:26 Updated Follow One mouthpiece costs 9.99€. We will offer a subscription model, where you can save 15% on replacements. Related articles How often do I have to replace the mouthpiece? Will there be different mouthpieces for soft, medium, and hard bristles? What are the Bluetooth features? Do the bristles reach the gum? Can I use my own toothpaste? Comments 0 comments Please sign in to leave a comment.