Open up your image in PhotoFiltre.
Go to Edit >> Define Pattern.
Then go to Filter >> Color >> Colored Layer.
Now using your Selection Tool on the Polygon setting, zoom in and select the teeth.
Now just click these buttons as much as you want until you get a result you like.
(Saturation only 2 times!)
When you press these buttons they don’t have to be in order! Just remember don’t press it too many times that it doesn’t look good with the picture!
After I finished with the teeth I deselected and pressed the following buttons for the overall picture once: