My dad's an orthodontist. He's seen good results with Invisalign (and bad) but says that it has a relatively small sweet spot. He's skeptical of the braces-by-mail approach for anything other than the simplest cases and the most conscientious patients.
> Dr. Son Tran, the creator of CrystalBraces and a Dallas dentist who is the sole reviewer
Many people don't know that in the US general dentists (GPs) can practice most specialties without advanced training, while specialists (orthodontists, oral surgeons, prosthodontists, etc.) must complete an accredited program/residency after dental school and limit their practice to their chosen specialty.