Well, if it's a boy - it's fairly easy to shave their head or give them a very close brush cut.
For a girl, this would be harder.
Some don't mind shaving their heads as a support for a family member with cancer, but for lice, they wouldn't do it.
Very short hair just makes it easy to deal with - there's less for the lice to hold on to and it's easy to comb through and it's easy to treat/wash.
Some say that a henna treatment will help get rid of lice.
I found this:
"Another belief is that covering the scalp with thick oil, Vaseline, mayonnaise, even peanut butter, can suffocate the lice. While this may be true, it would take hours to do so, and wouldn't harm any eggs. It's also pretty tough to remove afterwards. Certain essential oils—basil, rosemary, tea tree oil—have been alleged to have louse-killing properties. This hasn't been proven, however, and large amounts of some of these oils can harm small children.".