While Invisalign clear braces are removable, it is recommended that you only take them out for brushing and eating. It does not take long for teeth to start to shift back out of place and leaving your aligners out for prolonged periods of time could cause discomfort when you put them back in. Leaving your aligners out for too long can also extend the amount of time needed to complete your treatment. Wearing your aligners for at least 22 hours a day will ensure your treatment plan stays on schedule and you achieve optimal results.