Abilene, please do your own unbiased research instead of blindly believing what you are told by the professionals. And before you go to bed tonight, don't forget to read the warning label on your tube of toothpaste. Sounds a little dangerous to me. Now look up hydrogen and oxygen separately, and lo and behold, it would seem that pan of water you're thinking of putting on the stove should burst into flame, not boil. This is why no matter how helpful dictionaries are, they aren't used as chemistry textbooks.
Sodium fluoride is a poison.
Now use your dictionary to find out just how many things you ingest over the course of the day are also poisonous. The key here is toxicity level. Many of the things you eat, drink and breathe every day are toxic beyond a certain amount. Sodium fluoride also has a toxicity level, but we are talking about trace amounts. Please, everyone, the Internet is no place to learn chemistry or medicine.