When it comes to hairstyles that stand the test of time, nothing quite beats the versatility and perennial appeal of the bob ...

Jacob Schwartz is a hair colorist and the hair color trend ambassador for Schwarzkopf. He's worked with a ton of big names, including Bella Hadid, Troye Sivan, and Sydney Sweeney.

The experts break down what this treatment can do, which hair types it suits and the best at-home glossing buys ...