Amazing, award-winning Nitty Gritty Nit Free Comb quickly & easily removes not only head lice & unsightly nits (empty egg cases) but also extracts 'live' head louse eggs before they hatch. Instead of nasty chemicals, it gets the job done using advanced design & old-fashioned common sense. We are very proud of it, & if you don't think it's the best head lice product you've ever tried, we'll happily give you a full refund. At any time. That's how good it is. What's the big idea? Just as you slide your thumb up the side to 'pop' the lid off a jar, the Micro Spiral grooves of the Nit Free Comb slide through hair that's been coated with either our own Nitty Gritty Solution or any ordinary hair conditioner, & 'pop' off any louse, egg or nit that they come into contact with. It's the biggest advance in head lice treatment ever, we believe, & a million ' Nit Free' families in the UK wouldn't use anything else on their children's hair.