HOSA Dental Terminology Test 2025 – 400 Free Practice Questions to Pass the Exam

The root of a tooth refers specifically to the portion that is embedded in the alveolar process, which is the bony structure of the jaw that holds the teeth in place. This part of the tooth is not visible above the gum line; instead, it lies beneath the gums and provides stability and support to the tooth. The root contains the dental pulp, which houses nerves and blood vessels, but the defining characteristic of the root itself is its anchorage to the jawbone.

The other options describe different aspects of the tooth. The part of the tooth visible above the gum refers to the crown, and the portion exposed to the oral cavity is also associated with the crown. While the part containing the nerve is informative regarding the internal anatomy of the tooth, it does not accurately define the root in relation to the overall structure of the tooth. Thus, focusing on the root's location and its embedded nature in the alveolar process is what makes this answer correct.