Ok. I'll probably give up on seizure for now smile
http://www.epilepsy.com/epilepsy/firstaid_tonicclonic.html
But that's the official version. All these officials are too cautious for themselves, who wants to be sued for giving a not 100% safe advice to the not 100% normal people? But the real ill people are smarter:

"Hi mickey

in reading all of the accounts of tongue-destruction I was surprised to see that nobody had mentioned that "auras" before seizures often give enough time for the sufferer to put an appropriate-sized object in the mouth to save the tongue.

My husband suffers from epilepsy and had chomped his tongue repeatedly for years before he started carrying around a rolled up bandage in his pocket. He usually gets it into his mouth before the full-blown seizures occur.

Now, sometimes it doesn't do a perfect job and there are small pokes through the tongue. But the damage is nothing compared to what he was doing beforehand - a lot less blood!

Just make sure the roll of bandage you use is wide enough so you won't choke on it. We use a standard roll of gauze, about 6inches wide and 2 inches thick; then wrap in duct tape for durability (this was his idea, I thought it was softer without). He places it sideways, like a bar to bite down on; as the seizure takes hold, he grinds down on the bandage bar instead of his tongue. He carries it everywhere with him.

K"

More terrible stories about tongue biting are here:
http://ehealthforum.com/health/topic16513.html