I need to go to a dentist, "Orthodontics" is derived from the Greek "orthos" ("correct", "straight") 
Oh ok like to straighten teeth?
Orthodontics
Etymology.
"Orthodontics" is derived from the Greek "orthos" ("correct", "straight") and "-odont" ("tooth").
History.
The history of orthodontics has been intimately linked with the history of dentistry for more than 2,000 years. Dentistry had its origins as a part of medicine. According to the American Association of Orthodontists, archaeologists have discovered mummified ancients with metal bands wrapped around individual teeth.
Malocclusion is not a disease, but abnormal alignment of
Orthopedic surgery
Orthopedic surgery or orthopedics, also spelled orthopaedics, is the branch of surgery concerned with conditions involving the musculoskeletal system. Orthopedic surgeons use both surgical and nonsurgical means to treat musculoskeletal trauma, spine diseases, sports injuries, degenerative diseases, infections, tumors, and congenital disorders.
Etymology.
Nicholas Andry coined the word in French as "", derived from the Ancient Greek words ὀρθός "orthos" ("correct", "straight") and παιδίον "paidion" ("child"),