thanks for your query, i have gone through your query. the halitosis or bad breath commonly occurs because of the gum infection, decayed teeth, food lodgement, fissured tongue, pus discharge from an abscess secondary to tooth infection. it can also occur secondary to respiratory tract infection, gastrointestinal disorders, diabetes etc. so consult a oral physician to rule out all oral causes and the systemic diseases. you can get your teeth cleaned and maintain good oral hygiene. i hope my answer will help you. take care.