undo object smoothing [remove subdivision surface] While I was working in Edit Mode, I pressed Ctrl + 1, which smoothed my object. I pressed Ctrl + 0, which unsmoothed my object, and I moved on. However, when I bake a texture, it appears in the smoothed manner, I have gone long distances after that.

Is there any way to undo that smooth?

Thanks in advance!
That is the shortcut to add a Subdivision surface object modifier. This modifier uses an algorithm to smooth your object at a certain number of specified levels. To remove the modifier, not just disable it go to the Properties panel > Object modifiers tab (blue wrench) and click the X to remove it.

The subsurf modifier (image from the Wiki):