Why is my breath especially bad in the morning?

Morning breath is a natural phenomenon that everyone experiences. While you sleep, saliva flow drops sharply, so bacteria in the mouth multiply overnight and produce odor compounds. Three habits reduce it: 1) brush before bed and clean your tongue as well, 2) remove debris between the teeth with floss or an interdental brush, and 3) drink a glass of water and brush right after waking. However, if bad breath persists all day even after brushing, gum disease or a cavity may be the cause, so have an examination.