Slicing in golf is caused by coming over the top of the swing path. Usually your club face is at the target or open to the target when you come across the ball. It usually stems from a lack of shoulder rotation and/or absence of lateral bend. Slicing problems are also derived from a lead cupped wrist that keeps the club face open at impact, and causes the "Over the Top" movement.
The solution to slicing is not a gimmicky golf tip or drill. Those will only provide a temporary solution. A permanent solution comes from an understanding of ball flight laws and clubface control. It is imperative to note that the golf ball always curves away from the path direction. Swing left, the ball will go right. Swing right, the ball will go left.
For a lasting solution to fix a slice, use this drill to work on emulating a proper body motion that will promote a swing path that is more right of the target. Starting with a closed club face, swing back and close the face at impact with an In to Out path. When this drill is executed properly the dreaded slice will be forever gone and a permanent fix will be ingrained.