如何在photoshop中美白牙齿

To whiten teeth in Photoshop, you will need to:

1. Select the teeth with the freehand selection tool.
2. Open the hue/saturation tab
3. Click on the "master tab" to display colors and select "yellow"
4. Lower the saturation to "-100" and increase lightness to "+100"

To understand this steps, I recommend watching this video