Teen daughter had oral surg a couple months ago on impacted molar. no pain but recently she has very bad breath despite brushing, flossing & gargling?

?: Can be her nose, sinuses or her throat, check with her doctor, if he clears her may be still her teeth,

Bad breath: Can be from not removing sulfur producing bacteria, infection of teeth/gums/sinus/throat/tonsils-adenoids, change in diet, change in medication, GERD, etc. Start w professional cleaning and oral hygiene instruction @ your Dentist's office. Dentist may also want you to see your General a Physician for a work-up.