There are much more suitable punishments for a teen IMO, my parents used to ground me meaning, no tv, no dates, no sleep over, no phone, no computer (except for homework)..There was once when my step dad slapped me across the face and my knee jerk reaction was to hit him back and I did...I swear I'm not a violent kid and have ALWAYS been respectful to my elders, but I was 17 (and honestly didn't do anything to deserve it), so not only is hitting a teen useless, it could also be dangerous if the child has had a violent history of some sort...like I said, I'm not violent and I'm very respectful to my elders, but being slapped across the face was crossing the line and it made me snap. Ground them til they're 30, it'll be more effective.