Canker sores are vexing and common. The reason they occur isn’t clear, but your toothpaste could be a factor. An ingredient often used to make toothpaste foamy, sodium lauryl sulfate (SLS), has been ...

Medically reviewed by William Truswell, MD Strong concentrations of SLS can cause skin, mouth, or eye irritation.SLS may increase the likelihood of canker sores in people who are prone to them.High ...

Sanna Charlie, DDS, is a San Francisco-based general restorative dentist and an assistant clinical professor for the Preventative and Restorative Dental Sciences at UCSF School of Dentistry. She is ...