Toothpaste containing sodium lauryl sulfate (SLS) can cause or worsen canker sores (aphthous ulcers) due to its irritating effects on the delicate tissues inside the mouth. SLS is a detergent and foaming agent used in many toothpaste formulas to help create lather and remove debris. However, this ingredient has properties that can disrupt the protective mucous layer in the mouth. Here’s how it can contribute to canker sores: 1. Irritation of Mucous Membranes: SLS can irritate the lining of the mouth, making it more prone to minor trauma or sensitivity. This irritation can act as a trigger for canker sores in people who are predisposed to them. 2. Drying Effect: SLS has a drying effect, which may strip away the protective barrier of saliva. This dryness can leave the mouth more vulnerable to abrasions and infections. 3. Alteration of Oral Environment: SLS may increase permeability to irritants, acids, or bacteria, which can further inflame the tissues and contribute to the formation of sores. 4. Potential Allergenic Response: Some people may have a mild allergic reaction to SLS, leading to inflammation and sores. For individuals prone to canker sores, switching to an SLS-free toothpaste can significantly reduce their frequency and severity. Look for toothpaste labeled “SLS-free,” as these are formulated to be gentler on sensitive oral tissues.
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