The universal condition derives from the cessation of regular salivary flow with sleep. The byproducts of bacterial metabolism cause the foul odor. It helps to begin the assessment by directly confirming the reported odor. Differentiating halatosis caused by an oral source from a nasal one can be done by Treatment Treatment should be etiologic. Trying to mask the odor is far less effective than addressing its etiology.
Mouthwashes are a poor substitute for good oral hygiene.