The Lingual Technique is a type of orthodontic treatment that involves fixing braces to the inside of the teeth (i.e. on the ‘tongue side’). The Lingual Technique is the only real ‘invisible’ kind of orthodontic treatment because the braces which are fixed to the inside of the teeth are not really visible to other people. The Lingual Technique was developed because there are many people who would like to improve the positioning of their teeth but are not prepared to wear fixed braces that other people can see. One other kind of treatment that is also promoted as being invisible is the Aligner, but this is not really invisible at all because if you are very close to the person and the light is good, it becomes obvious that this person is wearing an aligner.