O.k. so now you will find out what a photoshop dufuss i am: whitening teeth, firstly ask my Models to go to the dentist, or use a whitening toothpaste and cut out tobacco, red wine & coffee from their diets, (joke)
So in Photoshop select the teeth, hue/saturation> choose yellow, de saturate all the way> open brightness/contrast> minus contrast a bit> boost brightness, bingo white teeth.
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