The slice is the most common problem with a golfer's swing. Slicing occurs when the club face is not squared to the ball at impact. If the face is too open, the golfer will slice the ball far to the right (for right-handed golfers, left for lefties) The slice is easy to correct, but like any bad habit, it can show up again without much warning.
Start with the proper stance--it's common for problems with your stance to throw off your swing. Stand with your legs a shoulder's width apart. The ball should be lined up just inside your front shoulder or front foot. Standing with the ball too far back or too far in front will make it hard to square the club face to the ball, reducing the possibility of the shot being straight.
Square the club face through your backswing as well as at the point of impact. If your club face is not held square during your back swing, there is very little chance it will remain square during your follow through. Your top wrist needs to remain locked during your entire shot. Practice by stopping at the highest point of your back swing and looking at your top wrist. If your top wrist is flat, then the club face is square; if your top wrist is bent at all, your shot will not be lined up correctly.
"Release" your swing properly. The proper release has your bottom hand crossing over their top hand. This will ensure that the club face cannot stay open and is forced to close through the ball instead of stopping short, which results in a slice.
Practice releasing the club properly by using a wide grip. Grip the club so there is a 1- to 3-inch gap in between your top and bottom hand. As you swing, this grip gives you no other option but to release the swing properly. Once you have gotten it down correctly, go back to your normal grip and try releasing your swing the same way.
Lift your head only after the ball has been struck. This might seem like a no-brainer, but a common problem, particularly with beginners, is to raise up too quickly. Every part of the golf swing is connected, and if you raise your head too soon, your shoulders turn too early, causing the ball to be struck with an open club face. Practice watching for the empty tee before lifting your head. It may seem obvious, but even the most seasoned golfer can regress into bad habits that can negatively affect their shot.
Grip the club using either the Vardon or interlocking grip. Flatten your bottom wrist slightly so that as you look down, you see the bottom hand's first two knuckles. As you pull the club down from your back swing into your follow through, this grip will force the club head to stay square to the ball.