An SLS-free shampoo does not contain the harsh and irritating ingredient sodium lauryl sulphate, which is a foaming agent (detergent) used by many hair care brands in the UK. Sulfates like sodium lauryl sulfate and sodium laureth sulfate don't just lift away dirt and grime, they also strip away the delicate layers of natural moisturizers (. Our guide to SLS, Sodium Lauryl Sulphate, and natural alternatives. if you're hip to oral hygiene acronyms, you already know sls stands for sodium lauryl sulfate. Most of the soap products on the market today contain an ingredient known as SLS. Browse our full range of SLS-free sensitive teeth toothpastes for gentle 24/7 protection from tooth sensitivity and pain relief, without sodium lauryl sulfate.