Is it candy, or is it poison? Or both? Tiny, black, and mysteriously vile, Sen-Sen seems to be something spies would hide in a false tooth to bite down on when captured. But in fact it's claimed to give "breathtaking refreshment" which "masks the odors of smoke, food or drink." The taste? Dead flowers, formaldehyde, licorice and cheap hotel soap. For over a hundred years old ladies have carried tiny foil pouches of Sen-Sen. I first experienced the noxious burning flavor as a little kid, digging for gum in my Grandma's purse. I suppose I never really recovered.