Persistent bad breath isn't always caused by poor brushing. Discover the hidden reasons your breath may still smell, the role of your oral microbiome, and science-backed strategies to achieve lasting fresh breath. Why Your Bad Breath Keeps Coming Back (Even After Brushing) You brush your teeth every morning. You brush again before bed. You floss regularly. You keep a pack of mints in your pocket. Yet, by lunchtime - or sometimes even sooner - you notice ...