Hey Morty. I remember all too well back in Atlantic Canada, undergoing that hideous in-class inspection by our health nurse.
Of course, little did I know, you could not only catch head lice; head lice love CLEAN hair.
Morty my dear. You've seen me in-person; I've seen you in-person.
Just the same, I do recall that there were things such as Xandria mentioned: nit combs. There is also a special shampoo.
But...I do recall the vinegar as a means of drying up the 'nits'. I do not know if it actually got rid of the lice. (the insect)
We had a horrible outbreak back east when I was in elementary/junior high. I would go home everyday and soak my head in warm water and vinegar. It drove me crazy!
Also, the stigmatism associated with head lice. Good heavens!
Talk to the boys, see what they're comfortable with. Just because something is 'in' doesn't mean that the former style doesn't resurface. Most trends/styles are recycled. But the short hair is A-OK. It's easier, that's for sure, to combat head lice....IF....it should happen. But head lice can happen anywheres. Give southern Ontario's 3 month heatwave, the little critters have had plenty of time to breed and make themselves readily available for head-to-head transport.
I'm keeping my hair short. No room for anything more than a headache.