<https://data.doctorgenius.com/definition/gum-line.rdf>
<http://schema.org/description>
"The gum line is the line in the mouth where the teeth and gums meet. If a patient struggles with gum recession, then the gum tissue around the teeth may begin to wear away."
<https://www.dentalexcellencegroupnj.com/dumont-nj/which-is-better-invisalign-or-braces/>