Bad breath may be of two causes.
Due to local cause that is improper oral hygiene which can be cured by oral prophylaxis
secondly due to systemic conditions such as asthma . Etc
first get it diagnosed and latter you can plan for treatment
Foul smell from mouth may be due to following reasions
gen. Foodlogment in mouth OR carious teeth with big cavity which allow foodlogment.
sinusitis- common cold
long time dry mouth i.E. No water Or food for long time
Have you checked your Tonsils? are they inflamed ?gastric ulcers?
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