1 https://en.wikipedia.org/wiki/Dental_braces#19th_century

2 https://www.healthline.com/health/how-long-do-braces-take

3 *Gu, J et al. Evaluation of Invisalign treatment effectiveness and efficiency compared with conventional fixed appliances using the Peer Assessment Rating index. Am J Orthod Dentofacial Orthop February 2017;151:259-66

*Buschang, P et al. Comparative time efficiency of aligner therapy and conventional edgewise braces. Angle Orthodontist, Vol 84, No 3, 2014

4 https://www.mayoclinic.org/diseases-conditions/cavities/symptoms-causes/syc-20352892