I found this post and I think it’s very usefull.

We all know some remedy myths or old wives tales, but some of them have no effect on conditions, ailments, or illnesses of the human body. If you try any of these myths, you may run the risk of having an adverse reaction or the opposite result of what you would like to happen. So here are ten classic emergency fixes that definitely won’t do in a pinch:

1. Sucking Venom From a Snakebite
Cutting the skin of a snakebite victim to suck out the poison may be a classic first-aid technique, but doctors now say it’s useless and even dangerous. “Cutting and sucking, or applying a tourniquet or ice does nothing to help,” says Dr. Robert Barish, an emergency physician at the University of Maryland. The outdated measures “may do more harm than good by delaying prompt medical care, contaminating the wound or by damaging nerves and blood vessels,” Barish says in an article released by the university’s School of Medicine and the Rocky Mountain Poison Center.
“The victim should be moved out of harm’s way and transported to the nearest medical facility as soon as possible,” Barish advises. So the best cure for snakebite: a cell phone and a helicopter.

2. Peeing on a Jellyfish Sting
You’re far more likely to suffer a jellyfish sting than a shark bite, so here’s what you need to know:
First, don’t believe the rumors. Peeing on a stung bit of skin won’t do much to relieve suffering, and you’ll suffer some odd stares, too, doctors say.
“Urine has not been scientifically proven to help in jellyfish stings”, said Dr. Paul Auerbach, an emergency physician at Stanford University Hospital and an expert on jellyfish stings.
“Instead, vinegar is the best first treatment,” he said, when treating stings from North American jellyfish.
But the question still lingers, if no vinegar is in sight is urine better than nothing? While studies haven’t proven it, Auerbach admits he’s known a few people who said urine worked for them.

3. Drinking Booze to Ease a Toothache
“A shot of whiskey is not going to kill the pain of a toothache,” says Charles Wakefield, D.D.S., director of advanced education in general dentistry at Baylor University medical school. Instead of a whiskey on the rocks, just order the rocks: A Canadian study found that rubbing an ice cube on people’s hands killed tooth pain in 50 percent of them. Wrap the cube and rub it on the V-shaped soft spot of your hand, where the bones of your thumb and index finger meet. The cold, rubbing sensation travels on the same pathway to the brain as tooth pain, and by icing your hand, you override the signals from your mouth. When you’re finished, call a dentist. And pour yourself that whiskey.

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