Manufacturers use sodium lauryl sulfate, or SLS, in a wide variety of cosmetics, detergents and other personal care products. Sodium lauryl sulfate acts as a surfactant, and helps to thicken the product and produce lather. It can also be found in many toothpastes, where it helps thicken the toothpaste and make it easier to spread across the teeth. Contrary to popular belief, there is no evidence or study to indicate that SLS causes cancer. Unfortunately, many experts link this chemical to a host of other dangers, including health and environmental issues.
Canker Sores
Aphthous ulcers, or canker sores, are painful wounds on the tongue, lips and soft tissues within the mouth. These sores last up to two weeks, and often recur over and over again for years. While no one knows for sure what causes canker sores, some experts believe that sodium lauryl sulfate may contribute to canker sore development. The University of Mary Washington suggests switching to an SLS-free toothpaste to reduce the risk of mouth sores or to minimize the associated pain and discomfort.
Chemical Exposure
Both the University of Mary Washington and North Washington Health Sciences University warn that SLS attacks the mucus membranes in the mouth, altering the structure of the skin. Some people believe that SLS allows more chemicals and toxins to enter the body by modifying skin structure. These chemicals may include other ingredients in toothpaste, or materials found in mouthwash or other cleansing products. This greater volume of chemicals leads to an elevated level of toxins in the bloodstream, which could impact health.
Eye and Skin Irritation
According to the International Programme on Chemical Safety, sodium lauryl sulfate acts as a skin and eye irritant that may impact short and long-term health. When you use toothpaste containing SLS, you may experience skin irritation around the mouth or on the face. If the toothpaste accidentally makes contact with your eyes, you may experience redness and irritation, depending on SLS concentration and your level of sensitivity. Over time, prolonged exposure may lead to dermatitis in sensitive individuals. SLS consumption is also linked to gastrointestinal distress in the form of diarrhea and vomiting.
Environmental Risks
People worldwide wash large volumes of SLS down the drain as they rinse away shampoo, detergent and toothpaste. As this chemical reaches local bodies of water, it may affect wildlife and water quality. According to the Pesticide Action Network, sodium lauryl sulfate is linked to aquatic toxicity, and acts as a dangerous toxin for a variety of fish, micro-organisms and other living creatures.
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