About a year ago, there was a kickstarter for a laser razor. It promised shaving using light at a certain frequency that supposedly caused the hair to just break, but without any invasion of the skin. It sounded amazing. A zillion people backed it, including me. We then got a note saying that Kickstarter had closed it because the proposer hadn't got a workable prototype, which is a requirement for Kickstarter.
However, the science might be plausible. We might one day be able to shave with a laser, with no skin irritation whatsoever. It would take a few moments and last indefinitely.
I think I'd miss shaving with blades and soaps and whatnot, but I don't think most people would.