SLS. It's not a distress call at sea. Nor is it an abbreviation your kids use while texting their friends. Nope. It's sodium lauryl sulfate and it's in many things you use every single day. From cleaners to cosmetics to toothpaste — it's a very common ingredient used to create foam for deeper cleaning. Have you ever wondered why you have to spit more with a particular toothpaste over another? That's sodium lauryl sulfate toothpaste. Check out the below to see how we dug a little deeper to get the complete picture on SLS.