Hi,
I have gone through your query & got it.
* There are multiple causes for morning
bad breath, but the fact, that Niquil gives you relief indicates it to be allergic
sinus,allergens being subjected in night time only.
Niquil is a combination of medicines to control fever/cough/allergic
cold.
Allergens give symptoms like cold, produces little rise in temperature due to sinus inflammation/ irritation of throat.As a result, the oral cavity gets dried, & thus produces bad breath.Antiallergic ( doxillamin succinate ) controls the basic cause & prevents drying of oral cavity.
* To control /avoid allergy is the basic way to avoid the condition.
Avoiding bed dust/smoking/having good oral hygiene/ drinking sufficient waterhelp.
Getting
allergy tests done & desensitization treatment is a cure to the problem
Thanks