Orthodontia (noun)

1. The branch of dentistry that deals with the diagnosis, prevention and treatment of dental and facial irregularities.
2. The treatment or correction of teeth that are positioned improperly.

Origin:

The word "orthodontia" is derived from the greek words "orthos" meaning "straight" and "odous" meaning "tooth".

Examples:

1. She received orthodontia treatment to straighten her teeth.
2. The orthodontia clinic specialized in braces and Invisalign.
3. He became an orthodontist after completing his orthodontia education.
4. The orthodontia treatment took about two years to complete.
5. The orthodontia cost was high, but the result was worth it.