Ask Dr S: How do whitening toothpastes work?

Most brands of adult toothpastes on store shelves boast whitening capabilities.  Many people wonder how these whitening toothpastes work, if they ruin your tooth enamel, and whether they work as well as bleaching trays. To get to the root of the first question, we have to understand how teeth stain.  The outer layer of our teeth is called the enamel. Enamel is a porous material, meaning it can hold things in the little spaces or holes it contains.  When we […]