This slightly rounds out the area you 're going to whiten . Go to Image > Adjustments > Hue / Saturation . For the teeth , choose Yellow in the edit screen and slide the Saturation bar down some . Then go to the edit screen again and choose Master and slide the Lightness bar up some .

Question: What may be the reason I am giving out detailed instructions ?
Answer: I am helping someone change the background of their website to make it whiter .I 'm trying to show someone how to make the bloodshot eyes in a photo look whiter .I am trying to help someone edit their photos so the subjects have a whiter smile .None of the above choices .