A pearly white smile isn’t always easy to come by. While some blame genetics, coffee and tea, teeth yellowing is a natural part of aging. Teeth whitening is a fairly new obsession, but with gels, lights, pastes and strips, the trend continues to pick up speed. This week on “Take Care,” we speak to Dr. Mark Burhenne about the different kinds of whitening products available and if they’re effective or even safe. Burhenne is a practicing dentist of over 30 years and creator of the popular website