I used to do the dead lift until i noticed my lower back would hurt a lot. I'm glad to say i was never injured during those exercises. When performed the dead lift i made sure my back was straight as possible and i still had pain. For me the dead lift isn't worth the risk of hurting yourself over. I agree on Freddie's view on the dangers of dead lift their are other exercises you can do that target the same muscles as the dead lift and much safer.