Sponsored Links: In this video we learn how to whiten teeth in Photoshop like a professional. Start off by opening up Photoshop and zooming in on the teeth in your photo. Start out by selecting a hollow brush and then paint the selection onto the teeth. Paint around them carefully and make sure you don't touch the gums in the middle and on the top of the teeth. Once you have selected the entire area of the teeth you will see them all covered in red. Then, go to "select" and "inverse", then press the button for saturation and go to "image" and "adjustments". Choose your saturation and then you're finished with this.