We hate to break it to you, but there’s some pretty nasty stuff hiding in your toothpaste. We call these bad boys the Toxic Ten. Meet SLS: a chemical compound used as a surfactant detergent. SLS irritates the mouth and strips away the lining, which can lead to canker sores, irritation and organ toxicity. Almost 16,000 studies have exposed the toxic nature of this chemical, yet it’s still in mainstream toothpaste.