Reddit mentions of Nit Free Terminator Lice Comb, Professional Stainless Steel Louse and Nit Comb for Head Lice Treatment, Removes Nits

Actually, most OTC treatments now don't work well as many lice have adapted to them. The best treatment is to take your kid to a lice removal specialist who will painstakingly comb out all the lice with a special comb, and then for you to keep combing their hair with the comb over the next few days. This is the comb, the ones that come in the shampoo kits don't work nearly as well.

Also an interesting fact: once the nits hatch, they will only want to feed on the blood type of their original host, so they will only infest someone with the same blood type.

I learned a lot about lice a few years ago. Ask me how I know.