Personally, I'm not a fan of Orajel or the like. They do reduce pain, but they can also leave a baby’s mouth feeling as if he has just been to the dentist. Some babies are happy with the pain relief, but others object to the swollen, numb sensation as much as they do to the pain. Either way, the effect of these gels doesn't last long and they do carry a small risk of allergic reactions and decreased gag reflexes.
Both Hylands tablets and Camilia tablets work well. Hylands also makes a homeopathic teething gel that I like a lot.
Gripe water can help because it alleviates gas and many LOs have more gas when teething - but it doesn't actually do much for the teething pain itself.