People who suffer from canker sores should be using a toothpaste that does NOT contain sodium laurel sulfate – the agent that causes toothpaste (and many other products) to foam. There is only one toothpaste on the market without SLS and I cannot think of the name of it at the moment. Shall post it when I can. This information was given to me either by my doctor or my dentist – I can’t remember now.
