Popsugar Fitness Summer Signs of Dehydration You Know You Need to Drink Water When . . . May 25, 2017 by Heather Dale View On One Page Photo 5 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 You Have Bad Breath Dry mouth leads to bad breath. You need salvia to fight stink-inducing bacteria, so drinking water regularly should keep your breath in check. Previous Next Start Slideshow SummerHealthy LivingHydrationDehydrationWater