What is pericoronitis?

Pericoronitis is indeed defined as an infection of the gums, specifically related to the area surrounding a partially erupted tooth, often seen with wisdom teeth. This condition usually occurs when food particles and bacteria become trapped beneath the gum flap that can form over the tooth, leading to inflammation and infection in that localized area. Symptoms may include pain, swelling, and difficulty opening the mouth, which are signs that should prompt dental evaluation and treatment.

The other choices relate to different dental or oral health issues. Tooth decay refers to the damage done to a tooth's structure due to bacteria and acid that results in cavities, which is distinct from the inflammatory condition of pericoronitis. An injury to the jaw would involve a mechanical impact or trauma, which does not pertain to an infectious process. Finally, swelling of the tongue may indicate other health issues or reactions but is not directly related to pericoronitis. Thus, the definition provided aligns perfectly with the characteristics of pericoronitis, reinforcing its identification as an infection of the gums.