Are you worrying about yellowish teeth in your photos? You can make your teeth whitest white by using photoshop.
I'm gonna choose this picture with yellow teeth and convert into whitest teeth.
1.To whiten the teeth select the dodge tool in the toolbox. Make the option seeings range: Midtones, Exposure:30%. Change the brush size so it is small enough to paint the teeth without touching the gums.
2.Paint the teeth just enough to make them slightly brighter. Don't make it very bright so that it looks artificial.
See the outcome:
Hope you all enjoyed the tutorial. If you have any queries add it in comments.
Have a great day!!!!