Hi.. Thanks for the query.. Well, bad breath also known as Halitosis can occur due to a number of causes like poor oral hygiene, oral and dental infections,post nasal drip, sinusitis, acid reflux,respiratory infections, diabetes etc.. You need to get the diagnosis confirmed that us ruling out the exact cause for bad breath and for this consult an Oral Physician.. For now you can start symptomatic treatment to mask the bad smell like gargle with a flavoured mouthwash twice a day.. You should chew mint or menthol flavoured sugar-free chewing gum.. Do warm saline gargles twice a day.. Limit the intake of high aroma foods like onion and garlic.. Drink plenty of water and maintain a good oral hygiene.. Hope this helps.. Regards