Unfortunately, no matter what the internet tells you, there's no magic DIY mask that will give you longer hair after just one application. According to Dr. Rachel Nazarian of NYC's Schweiger Dermatology Group, "There's nothing you can do to speed up hair growth — period. All human hair grows at a rate of half an inch each month." Womp.
That said, there is one thing that will immediately lengthen your hair: extensions. Though pricey, these can come in handy if you got a shorter-than-ideal cut right before a big event. "If it's a devastating circumstance — like, if you're getting married next week — invest in hair extensions," Toth said.