I think what danny was meening.. was when you first extrue them. you are given the perportional modification tool to do it with..

I don't know if you can select all the faces now and use the perportional modification tool on them or not.. if it dosn't work thin I would try re-extruding them.

maybe you could undo what you have done already.. that is a cool idea btw.. makeing it how you did.. (least to me)

but start off agin and this time when you extrue the faces.. click on one of the boxes of the tool, when the yello scale box is on.. thin scale all the faces down some.. they will stay whare they are around the circle not get pulled in like you might think.. thin after you have the faces that will become the outside of the teath the size you want.. thin pull on the arows of the tool.. to pull all of the teath out.. in space whare they need to be..