When it comes to hitting slices and then stopping yourself from hitting a slice, we need to understand the reason why the ball goes in that direction. Number one is the ball will start where the club face points impact. Now, most of you slices are good at getting the club face pointing at target. The big problem is, is that the golf clubs not swinging around through the impact area in a neutral fashion, it's moving across the body.
So if we think about it here, if this stick is the target line, your golf swing is often moving across the target line this way. When your club face is pointing down the target line, the greater the distance between the direction you swing and the position of the club face moves, the ball is going to curve more to the right, and then you're going to hit your slice. Obviously, if you're a left handed golfer just reverse these two, and that is going to be the reason why you slice.