U.S. Orthodontics Market Size, Share & COVID-19 Impact Analysis, By Type (Braces [Traditional Braces, Metal Braces, and Lingual Braces] and Clear Aligners [Traditional and Direct to Consumer]), By Age Group (Adult and Teenager), and by End-user (Dental/Orthodontic Clinics, Direct to Consumer, and Others), and Forecast, 2022-2029