Whenever the need arises to make a natural element white or whiter (such as in portraits of people), it’s tempting to set the foreground color to white and reach for the brush tool. This works if applied with care, but it’s easier to achieve a more realistic effect using other Photoshop tools. Here, a small amount of whitening applied to the model’s teeth and eyes will lift the whole image. PhotoshopSupport has a quick tutorial on how to whiten the eyes and teeth of your subject in Photoshop.