Keep the contrast in terms with the rest of the photograph to maintain realism.
Few requirements need to be met in order to make teeth whiter in photographs. The proper computer software (Adobe Photoshop is a prime example) has the capabilities to do this quickly and easily, while trying to alter the photograph in any other way can be quite a hassle. This software can be expensive, however, freeware such as Photoscape can be used to do the job, albeit without the convenience of other software.
Instructions
1. Open your image in the photo editing software. Most editing softwares use the same general process of going to File, then clicking Open. Select the file you wish to edit from the list that pops up and click Open.
2. Select the teeth you wish to whiten. Software such as Photoshop and Corel have automatic selection tools, although they can be a bit tricky to use. Another option is to use the Pen tool to select the area much more accurately along the contours of its shape, but this can require a good bit of practice to become proficient.
3. Find the adjustment for the levels of your selection. In Photoshop, this can be found by clicking "Image," then "Adjustments" and finally, "Levels." Use the slider that pops up to move the lighting levels of your selection left or right, making them lighter or darker. Keep the slider at the appropriate amount of whiteness you wish to make the teeth, then click "OK."
4. Fix the contrast if the teeth are too bright. Find the Contrast adjustment setting in your software (for Photoshop, click "Image," then "Adjustments," then "Contrast"). Adjust the contrast of the teeth to better match the lighting of the rest of the photo. This will keep most of the whitening made in the previous step while toning the brightness of the teeth down to a more realistic level.
