My aligner is loose on one side on very back tooth. What should I do?

There are times when an aligner may not fully seat against the teeth.  This may happen when you are putting a new aligner on for the first time.  Often times, the aligners will seat better over time as you continue to bite into and wear them.  It is also possible that there is an issue with the manufacturing.If this is a consistent issue, it could be due to lack of tracking or need for an attachment for retention of the aligner.In any event, it is best to get in to see your doctor if you have any questions.  Hope that helps!