I don't know the cause of my bad breath; I previously had a dental cavity.

Bad breath may be closely related to previous dental cavities. 1. Dental cavities often indicate tooth decay, which provides a favorable environment for bacterial growth. Food debris and plaque tend to remain in the cavities, where they ferment and produce a foul odor, making them one of the direct causes of bad breath. 2. If cavities are not cleaned and treated promptly, bacterial proliferation may worsen, causing the cavities to gradually deepen and enlarge, and even lead to pulpitis, further aggravating the problem of bad breath. Therefore, patients with dental cavities accompanied by bad breath are advised to visit a dentist promptly for cavity filling and treatment to eliminate the root cause of bad breath. At the same time, maintaining good oral hygiene habits is also an important measure for preventing bad breath.