i dont think so, my mom it in my 4 year old brothers mouth for cursing at me lol, he had to hold it there for 5 seconds lol. it waz classic!
dawn makes more bubbles.. Regardless of the brand of dish soap you use, (other sites claim Palmolive, Ivory, Dawn or other brand), add a small amount of glycerin for blowing bubbles (not for bathing)...
It just depends on the type of water presssure, the tempeture, and how much water you put in it.