How to un-extrude an object? I was making a cup handle so I extruded a face of the cup, then however I right clicked and thought that would undo it. I didn't notice the dent it left though, after that I did a bunch of smoothing on the cup and then when I went back to extrude it, it didn't create the smoothing I wanted. That's when I noticed the dent, I decided to make the handle on a different face, but is there any way I can remove the ugly dent?

P.S I am a beginner so please don't be angry with me for thinking right click was undo.

P.P.S Cup is on layer 2.
It seems you have extruded several times but did not moved the extruded vertices.

In this particular case, to remove that:


Select the top extruded face (CtrlTab then choose 'face' and right click to select the face)
Use CtrlNumpad+ to extend the selection. Do that several times. You know you are ok when the selection come to the surrounding parts, when it is deselect twice using CtrlNumpad-
X to delete the selected vertices
CtrlTab then choose 'edge' this time
AltRMB to select the edges surrounding the hole
F to remake the face