The secret to get the best result when it comes to whiten yellow teeth is to make the perfect selection around the teeth. Perfectly selecting the right shade of colors. Look at the image below and the yellow shade on it. I will make selection on yellow and work on it.
From adjustment layer icon select Hue Saturation. Have a look at the image below to understand more about it clearly. I numbered it to you can understand it step by step. Then select the hand tool from the pop up window that i numbered with 2. Then click on the teeth where you have more yellow shade teeth (No 3).
When you click on the yellow shade on the teeth you should see yellow name is mentioned there (No. 3). Now move the Hue and Saturation all they way to the right.
Now here is the important part of the whole thing. You need to be careful here and make perfect selection. Look and the image below and slide left and right to make the selection good. When more yellow on the teeth you made a good selection. Now you can increase the brightness as much as you want and also reduce the Hue little bit.
Now because of it has selected the skin area of the image you need to create mask on it to put the white effect only one the teeth. What you can do is to select the mask (no. 1) then select the brash (no. 2). After that make the foreground color white and paint the brash on teeth only. You would amazingly all teeth is becoming white (no 4).
Now have a look at the amazing change.
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