Bad breath isn't a smell problem. It's a bacteria problem.
Coffee, lunch, and hours between brushing create bacterial buildup that releases sulfur compounds (that's the smell). Mints and gum perfume over it. The bacteria keep thriving underneath your spearmint cover-up.
Mint Sprint 30's sonic micro-bristles physically lift film and particles while neutralizing odor at the source. You're not covering up anymore. You're actually cleaning.