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 ...

When you brush your teeth, the foamy mixture of toothpaste and saliva washes over all of these areas, leaving a thin film of SLS and flavoring agents that can continue to influence taste long after ...