Orthodontists are incentivized against embracing orthotropics by their current knowledge and business model. They prefer interventions they can charge for (braces, slenderizing) over practices which can be adopted without intervention. This may be why the field emerged from dentists rather than orthodontists.
“It is difficult to get a man to understand something, when his salary depends upon his not understanding it”
— Upton Sinclair
“It is difficult to get a man to understand something, when his salary depends upon his not understanding it” — Upton Sinclair