What cause bad breath? How could u fix that problem bad breath

VSC. Vsc, or variable sulfur compound, is the end product of blood. Bleeding in your mouth is due to gingival inflammation from food impaction, abscess, infection, faulty restorations. Other cause of bad breath is medical related (gi problems, diabetes). Treatment required treating the cause of bad breath.
See your dentist. Sources: gut, plaque (germs), pus (infection), cavities (rotting tooth). See your dentist to find the reason for yours. Until then: avoid foods that cause it (garlic, onions, certain spices); floss and brush your teeth (every night); use listerine (essential oils help), and cut out the sugar habit to minimize further decay (note--i didn't say "eliminate" decay).