Hair tends to frizz over time or when using the wrong shampoo. It's normal, but it's quite a common problem, and not just for girls. My brother has long hair, and he was always proud of the fact that it looked better than his ex-girlfriends. Even I was jealous, to be honest. He once had a bad experience with cheap shampoo, and it ruined the beauty of his hair. His hair was constantly split and didn't look good. We searched the internet together for tips on how to loosen curls and found something interesting besides keratin. It was a success.