Invisalign are clear aligners that can be removed and look to move teeth slowly over time. Invisalign are sometimes called 'invisible braces' as they are made from a transparent plastic material that fits over the team making them largely unidentifiable. Lingual braces, sometimes known as 'hidden braces', are like traditional braces apart from the fact that lingual braces are fitted to the inside of your teeth (by the tongue and palate).