Question

which condition is an oral cause of halitosis?
rhinitis
sinusitis
tonsillitis
xerostomia

Explanation:

Rhinitis affects the nose, sinusitis affects the sinuses, and tonsillitis affects the tonsils. Xerostomia, or dry - mouth, is an oral condition that can cause halitosis as reduced saliva flow allows bacteria to thrive and produce bad - smelling compounds.

Answer:

D. Xerostomia