In Netflix’s new thriller, I Care a Lot, Rosamund Pike’s devious character Marla Grayson is drugged and sent over a bridge and into a river in her car. Amazingly, she survives the crash and only loses a tooth in the process. Marla then puts her knocked-out tooth in a small carton of milk until she can get to the dentist to have the tooth fixed. If you've watched the film, you probably wondering if putting a dislocated tooth in milk really works and why. Turns out, Netflix didn’t make this up: This idea has been circulating for ages, and turns out, it's legit.