One of the most common questions I get in dentistry has absolutely nothing to do with teeth. It's "What does that blue light do?" Well, the blue light is actually a magic wand, the only we have. All right, but it does allow us to transform smiles. The blue light actually allows the dental materials that we have to set hard. So if we are able to sculpt some composite onto a tooth, that blue light that sounds like more a hair dryer, it actually makes the materials set, and allows us to create beautiful dentistry.