They are custom-made for every person and designed to move teeth in the desired direction very very slowly. This is achieved by digitally capturing impressions and processing the information using specialized software, where the future projections for better results and straighter teeth are computed and then the milling machine automatically custom fabricates the set of trays for you. On average, a person needs approximately 25-40 sets for complete alignment. The clear aligners or invisible braces come with an advantage i.e. they are very snugly fitting which over a period becomes virtually a part of the body and hence causes no speech problems. There are no restrictions on eating and drinking any foods as you will be removing them before every meal.
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