Answer: "Ortho" means "straight" or "correct", while "odontos" means "teeth".
Explanation: "Ortho" is a Greek prefix that means "right" or "correct". It is used to form many words, such as "orthopedic" and "orthodoxy". On the other hand, "odontos", which also comes from Greek, means "teeth". In that way, words such as "odontology" and "odontophobia" contain the root "odonto". Taking this into account, "orthodontist" is used to refer to a dentist whose job is to correct the position in which a patient's teeth are.
