We usually suggest changing aligners every 2 weeks in order to give your bones and tissues time to heal and fill in as your teeth shift. This is for your comfort, safety and best long-term results. However, some people notice that their trays are consistently becoming loose after 7-10 days. In some of these cases, it's ok to change them out earlier - as early as every 10 days. Please contact our customer support before changing your schedule. You may also wish to consult with your local dentist or orthodontist before doing so.