Some operations that you can do in Edit Mode do not automatically snap the resulting mesh to the surface like RetopoFlow does. Or, you may find while working that you have common mesh issues like doubles or flipped faces.
To fix all of the common retopology problems at once, you can use Retopoflow’s Clean Up operator. It can be found in the tool settings and in the pie menu (W
) and be used on either all vertices or selected vertices only.
The clean up operator can optionally:
If you are working on a very dense mesh and do not need all of those operations, consider turning the unnecissary ones off to speed up the operation.