For FirstAid in the home or wilderness.
The AMA* now recommends:

wedge it all the way in there...it's no good if it all falls out when you move your head.

you don't need the whole tail, but don't be miserly with it either.

Unfortunately the researchers don't make clear whether the scorpion has to be alive. Experiment.

note: chicken teeth are not a suitable substitute
We at Trickgnosis wish you a long and healthful life!
*Anomalous Medical Association