Corns are a frequent disorder affecting the foot. Corns are a natural response to pressure as the skin thickens up to protect itself from that pressure. At some stage this process fails and becomes so thick that it's painful. You will find a consistent myth that corns have roots which they carry on growing back from whenever you attempt to take them out. This is like the analogy of plants that re-grow from their roots if you cut the top of the plants off. That analogy continues to be given to corns as they keep growing back again, but they do not have roots to grow back from.
Corns originate from pressure and a proficient podiatric doctor can readily eliminate a corn. However, after the corn is removed if the pressure that caused it is still there then, obviously, it is going to come back. It comes back since the cause remains rather than because the podiatrist left a root there for the corn to develop back from. That pressure could be from a poor fitting shoe or from something like a mallet toe or bunion that leads to increased pressure on an area. If the corn is beneath the foot, then the cause is greater pressure on the spot where the corn is, most likely due to the way you walk.
The myth remains simply because they do come back, so its essential to remove the cause at the same time the corn is taken off. There is absolutely no root to be taken out. This means that the pressure on the foot the location where the corn was has to be decreased or removed. This will involve issues like using better fitting shoes or the use of padding to get pressure off the location where the corn is. Occasionally surgery will be required to the bone underneath the corn to eliminate the pressure. If that cause isn't eliminated or decreased then the corn will return, therefore it is clear to understand where the myth concerning corn roots arises from.