Where can I update my mouthpiece size? August 02, 2021 08:57 Updated Follow If you need to change your mouthpiece size, you can do it from your Willo account. Log in to your Willo account and click the "Subscription" tab Click on 'View' Click on 'Edit Size' That's it! Related articles Can I change the next delivery date for my Fresh Routine Refills? How do I update my payment method? Do I still need to floss after using Willo? Is Willo a waterflosser? How do I know my mouthpiece size? How often are refills delivered?