He has a fairly short haircut but longer on top and falling down over his forehead. He had lovely round curls when he was mid-childhood age and wants curls on top again. I'm not sure if it's hormones/ more oil in his hair (he washes it nightly) but it is falling quite flat. I have tried mousse and gel, scrunching it, diffuser, still no curls. Is there anything else he can try?! These are the kind of urgent teen problems he presents to me in expectation of a solution so thanks in advance!