My dd will be 11 soon, and we've struggled with headlice since she was halfway through Foundation. I repeatedly treat it and it clears, only for her to get it again straight after every school holiday!
She's got another year left at primary school, and I'm really hoping to be able to stop the endless conditioning, combing and spending out on expensive treatments, once she leaves. Do parents of secondary school children generally find the problem goes away once they've 11/12 years old?