Invisalign® clear aligners work by using a series of custom-made aligners that are designed to gradually shift the teeth into their proper position. The aligners are made from a clear, plastic material that is comfortable to wear and nearly invisible. The patient wears each set of aligners for two weeks before switching to the next set in the series. Each set of aligners is slightly different to slowly shift your teeth into proper position, applying gentle pressure to the teeth to move them.