You might have also spent the three-hour-long musical questioning some of the show’s big beauty moments: How did the T-Birds grease back their dos? How did Sandy’s hair ribbons stay so secure?

Welcome to Retro Week, where we’ll be ... you’ll want a pomade with a high oil content—not a water based pomade. It will make your hair feel pretty, well, greasy, but that’s the idea.

Her innocent school girl look features a pretty retro hairstyle ... The look is classic and timeless. Rizzo’s hair is really curly, but leaving your ends out while using a curling iron will ...

Decades later, Bowzer of Sha Na Na told me his band's secret for slicked-back hair that washed out easily: K-Y Jelly.) Sha Na Na kicked off the craze in 1969, and "Grease," the original stage ...