I've heard about lasers being used in medicine but I'm not sure how they work. Are they safe?

Simply put, a laser is a highly concentrated beam of light. Medical lasers work by delivering this light energy to the targeted tissue with extreme precision so as not to affect the surrounding tissue. And they've proven their safety and effectiveness through the years of use in all kinds of medical procedures from eye surgery to dermatology. In the hands of a skilled physician, lasers offer far less risk and complications than conventional surgery.