Constantly struggling with dry and flaky lips? Surprisingly, your toothpaste may be to blame. Most toothpastes contain an irritating ingredient called sodium lauryl sulfate (SLS). Manufacturers use SLS in a lot of products because it's cheap and gives a foamy effect consumers love but it is super drying. Look for an SLS-free toothpaste like Kiss My Face or Trader Joe's brand and while your at it double check your cleansers and shampoo don't contain this stripping ingredient either. Your skin and lips will be so much happier.