SmileTru was founded in 2012 in the USA as a clear orthodontic aligner system similar to other systems such as Invisalign. Each clear aligner is custom-made for the patient. Each aligner is worn for at least 2 weeks before changing over to the next pair of aligners. Often a few clear “buttons” need to be placed on the teeth if they require to be rotated or moved. These buttons are called “attachments” are are not normally visible underneath the aligner when they are worn.