Getting braces used to be a nightmare. It required having metal brackets and wires inside the mouth, an often uncomfortable and painful experience that involved cuts, sores, and blisters. In addition, metal braces make it difficult to speak and eat, and for many who have to wear them, they are just plain unsightly. Adults who want to improve their smiles using braces may be hesitant to experience all of those things, but fortunately, there is now an option that gets rid of the challenges without sacrificing the smile: invisible braces.
http://www.lbdp.co.uk/blog/no-metal-mouth-invisible-braces-london-better-alternative