Corns on the feet are due to an excessive amount of pressure on that place where the corn is. To remove corns, all you have to do is remove that pressure which caused it. Its that easy. A corn or a callus is part of a process which the skin undergoes to protect itself. Whenever there is an excessive amount of pressure on an area of skin, the skin thickens up to protect itself. However, in the event that pressure remains over a extended period of time, then the skin will become so thick that it can be painful. If that pressure is spread over a broader area of skin, then that is called a callus. In the event that pressure is over a smaller much more focal area, then that's a corn. The sources of that greater pressure may be a number of things such as a claw toe, hallux valgus or a prominent bone. A proper evaluation is usually necessary to identify just what it is that is bringing about that higher pressure and just how easy it can be to remove that higher pressure.
To get rid of corns totally, you need to take away the cause. A skilled podiatrist can easily remove a callus and corn by properly debriding it using a scalpel. Nevertheless, that corn will return should the reason for them is just not removed. They just don't return because the podiatrist failed to take it off correctly or because the corn has roots (they don’t). They keep returning for the reason that the pressure which caused them continues. That must be taken away if the corns is to be stopped from recurring. The way that the pressure is removed will depend on why you have the greater pressure. Perhaps it is as basic as getting a better fitting pair of footwear or it might be as complex as needing some surgery to take care of the toe deformity that could be causing the pressure resulting in the corn.