You wear each set of aligners for about two weeks, removing them only to eat, drink, brush, and floss. As you replace each aligner with the next in the series, your teeth will move — little by little, week by week — until they have straightened to their final positions. You’ll visit us about once every eight weeks to ensure that your treatment is progressing as planned. Total treatment time averages nine to 18 months and the average number of aligners worn during treatment is between 18 and 30, but both will vary from case to case.