We've been battling licence on and off for about a month & blaming re-infection from school (got clear over half-term), but now I am sure that the nitty gritty is passing over at least some (most) of the eggs in my very wriggly 3yo's hair.
He's white-blonde so they're easy to spot, we're slathering with Boots' own tea tree conditioner before combing, but the teeth literally pass over and leave the egg in place 80% of the first pass.
Tonight we resorted to pulling out the eggs with tweezers, but it's hard and poor DS's patience ran out so there's bound to be a sneaky one remaining! No crawlers found.
Thanks!