<https://data.doctorgenius.com/definition/smart-track-material.rdf>
<http://schema.org/description>
"Smart Track® material is in Invisalign® aligners to increase comfort, improve control of movement, increases the speed of treatment and applies a gentle force to the teeth over time."
<https://www.dentalexcellencegroupnj.com/dumont-nj/which-is-better-invisalign-or-braces/>