What is the term for tooth decay that destroys tooth tissue?

The correct term for tooth decay that destroys tooth tissue is "caries." This term specifically refers to the process of demineralization and cavity formation due to the activity of bacteria in the mouth, which feed on sugars and produce acids that harm the enamel and dentin of teeth.

Caries is a significant dental health issue, as it can progress if untreated, leading to pain, infection, and potential tooth loss. It highlights the importance of good oral hygiene practices, including regular brushing, flossing, and dental check-ups, to prevent and manage tooth decay.

The other terms do not pertain to tooth decay. "Depending factor" does not relate to dental pathology, "decay disease" is not a recognized term in dental terminology, and "gingivitis" refers specifically to inflammation of the gums, which, while related to oral health, is distinct from the decay of tooth tissue itself.