The usual and quite common thing used are gum guards. They work quite well and prevent your teeth from being knocked out. You don't even have to go for the more expensive ones, the cheaper ones will do the trick. There are even flavoured gum guards on sale . They come in hany for long games or at tournaments.
For your legs, mainly your shins, you must use shin pads or guards. They are by far the most important thing to have, besides having a hockey stick. I've heard all kinds of stories about people who forgrt to use them. I'm not sure if they are all ture but I'm not going to take any chances.
I never thought you could use these for firld hockey and I've never seen any one with them. I would only wear one of these if it's really necessary.
If you do a lot of tackling, you should consider getting your self a glove. It can become a bit wet from sweat but it's totally worth it. I would rather have a sweaty hand than bruised knuckles or a bruised hand.
So that's how you play it safe and still enjoy the game, rather than ending up like these people...
