On this A Tale of Two Hygienists bonus episode powered by Crest Oral-B we are joined by Paul Sagel. Paul is a top innovator at Procter & Gamble, inventor of Crest Whitestrips, Crest HD and a new innovation, Crest Whitening Emulsions. Paul joins us to talk about all things whitening. Spoiler alert, both Michelle and Andrew learned things about the whitening process they didn’t know and this episode broke down and explained some whitening myths!    Episode Highlights:    Paul’s background Development  What makes whitening “tick”  Product design and stability  Sensitivity  Whitening actives  Contact time and concentration  Crest Whitening Emulsions  LED light  Patient conversations Whitening your teeth improves your oral health   Quotes:   “I look at people's teeth and think that is so easy to fix.”    “There is an interesting thing with the symmetry of your face, particularly if your eyes and teeth are drastically different colors.”    “You really don’t need a very thick layer of peroxide on the tooth's surface to whiten.”    “I put some of the composition on the plastic food wrap and I said this is it!”   “When we started doing this there was virtually no research out there to show that bleaching was safe.”    “As we take up concentrations we make the layers thinner and thinner to make sure the soft tissue tolerability is acceptable.”    “Dehydration of the teeth amplifies tooth sensitivity.”    “These chlorine based bleaches are pretty strong, they do have the ability at sufficient concentrations to cause some structural problems.”    “There are a lot of smoke and mirrors in the whitening industry.”    “The only thing that will generate the intensity required is LEDs and you need to have the right current going through them, and they need to be eye safe.”    “Products that lack efficacy really hurt the category.”    “Whitening is one of the best things you can do for your smile and your confidence.”    “Emulsions hit the mountain peaks, and the valleys.”    Resources and Links:    Crest Oral-B Pro shop   Crest Oral-B Emulsions   Crest Oral-B Whitening