Should have used the teeth from source 1.
Edit: Yep, looks better!

Yeah thanks for the idea I don't know why I think of it appreciate it !!!

Nice job blurring the bits. I think if you colorized the face it would give you more contrast against the drill bits. Right now the bits get a little lost with the background because they're the same color. Good luck!

i tried colorizing but i cant find the color that will make legitimate skin color. I either get too yellow, too orange, or too red.

Skin usually doesn't have just one color in it. I would suggest making several hue/saturation adjustment layers and painting in the face with multiple layers. After you have masked the adjustment layers you can then edit the layer for the right color.....Another option is to open a similar image of a person and just sample the colors on the face and then paint them on a new layer set to color above your image. afterwards you can just adjust the hue/saturation of the layer. Good luck! Here is a tutorial I wrote, hope it will help you.
http://www.pxleyes.com/tutorial/photoshop/2239/Add-Ultra-Realistic-Colors-to-Any-Gray-Scale-Photo.html

This is very nerve wracking ... I love to hate this one! But then I am not particularly keen on Dentist ... you nailed one of my pet fears on the head!