Invisalign refers to a series of transparent, removable teeth trays that can be used in place of traditional braces to shape the teeth. Invisalign braces evolved as a response to the need to find a suitable alternative to the clumsy looking for traditional metal braces, it has been used for dental alignment. Invisalign braces are clear plastic removable parts which is apparently invisible when they were placed on the teeth. The Invisalign invisible and convenience of use and maintenance has made them a popular alternative to traditional metal braces.