Step-By-Step Instructions:
1. Open in Photoshop the photograph of a person whose white teeth are displayed.
2. Click the “Edit in Quick Mask Mode” toggle button.
3. Select the Paint Brush tool and choose black as your color.
4. Zoom in on the teeth and paint over them. (When you are in Quick Mask Mode, the paint will be a transparent red).
5. When you are finished, click the “Edit in Standard Mode” toggle button.
6. Goto Select > Inverse. The teeth should now be selected.
7. Goto Image > Adjustments > Color Balance.
8. Adjust the bottom slider under Midtones to “Yellow”. Do this for the Shadows also.
9. The bright teeth should now be nicotine yellowish color.
