I crushed the nail bed of my index finger a few days ago when my finger got caught (twisted and smooshed) on my luggage strap as I was lifting it down from the overhead bin. It hurt soooooo badly, I was certain my nail would turn black and eventually fall off. As soon as I got home, I soaked my still throbbing finger tip in straight apple cider vinegar for about 15 minutes. The rest of the night I felt sudden shooting pains. However, the next morning, my pain had subsided by 75% and the only time it hurt is if I pressed on the nail bed. 24 hours later, no pain, no discoloration. Yes!!!