We’ve all learned to develop a built-in gimmick detector when it comes to such things.
The odds are it’s merely the latest product the salon is trying to push.
The only con is you might get addicted to that unmatched glossy finish.

L’Oreal has essentially spearheaded the 10-minute French gloss movement.
Even after sleeping on it, the frizz is minimal and the sheen is still there."
