I have this strange offensive odor coming from my nose. ent cleared ct not sinus problem, no dental problem. what else could it be. please help. ?

GIT ?: If ENT and oral cavity are cleared there is only one left cause for the odor , consult an internist for possible git problems, like indigestion and hyper acidity and such, and yes git can cause odor from your nose if your mouth closed..

See a neurologist: Parosmia is a change in the normal perception of odors, such as when the smell of something regular is distorted, or when something that normally smells pleasant now smells foul. See a neurologist for smell disorder evaluation.