We can greatly improve every portrait in which the subject is smiling by applying a little digital tooth whitening. In this easy to follow tutorial you will be whitening teeth in minutes.
We will first select the teeth and soften the selection, to avoid a visible line between the areas that are lightened and the rest of the image. Although there are many ways to make a selection in Photoshop, using the Quick Selection Quick Mask works well when making a detailed selection such as selecting a person’s teeth
Open an image and Zoom in to make a selection.
Note: that a new adjustment layers is created and the selection is hidden. If the adjustment panel it’s not showing go to Window-Adjustments to show the panel.
9. In the Hue/Saturation option select Yellows.
10. Click and drag the Saturation slider slowly to the left to remove the yellow, in our case a value of -80 works just fine.
11. Click and drag the Lightness slider slowly to the right to brighten the teeth.
12. Select Master form the menu.
13. Click and drag the Lightness slider slowly to the right to complete the effect.