There is no problem if you change the trays 2-3 days late. It is always OK if you wear the trays longer than you are supposed to. Issues may start if you are wearing them less. Just make sure you are wearing the next trays for the prescribed amount of time as well -- this may require adjusting your appointment if necessary.Great question!- Dr. Pam
Dear Sarahill,Thank you for posting your question on Real Self. I will answer your question the best that I can with the information given.Do not be concerned with changing your aligner a few days later. The only consequence is that you are 2-3 days behind in your treatment time which is not a problem. If you are consistently late changing your aligners, I would mention it to your doctor so they have a better idea of your date of completion.I hope that this helps and good luck!Best,Dr. Jenn