First, we would like to assure you that we stand behind the quality and effectiveness of our product. In the event that you receive the Feno Smartbrush and find that the sizing is not quite right for you, we offer free replacements for up to 2 mouthpieces. This ensures that you can find the perfect fit without any additional cost.

Furthermore, we offer a 30-day money-back guarantee from the date of shipment. This means that if you are not completely satisfied with the product, even after trying the replacement mouthpieces, you can return it within 30 days of the shipment date for a full refund. Simply contact our customer service team to initiate the return process.

Your satisfaction is our utmost priority, and we are confident that our product will ensure that you have a positive experience. If you have any further questions or concerns, please don't hesitate to reach out to us.