For me, the only thing that worked was physically removing the lice & nits from my head with a metal lice comb. I found the comb at my local grocery store, but I would expect pharmacies to carry them, too. Metal is key. The plastic ones had tines that were too far apart (or if they were close together, they wore down to increase the gap quickly). I had a cup or bowl of water that I would flick all the lice into after each stroke with the comb.
Rosemary is supposed to repel the lice. Lots of herbal shampoos contain it, because it's supposed to be good for hair anyway. TTO is also a repellent, though less common in shampoos.
My hair was long enough to sit on. I would wash my hair, wait until it was dry, then brush and comb it to remove all the knots (even the tiny ones) before using the lice comb. The first couple of days, the lice comb did really hurt. It felt like it was finding knots that even the regular comb hadn't removed. After that, it went much easier. Using the lice comb worked when none of the shampoos I tried did.
Remember that wet hair is also easily breakable hair. If you're trying to comb through wet hair, you should use copious quantities of conditioner!
I think the reason they don't recommend TTO for lice extermination is that you have to use it pretty much undiluted for that. You can, however, use TTO (or rosemary) shampoos as a preventative, because they make your head less appealing to the critters.
My kids' pediatrician recommended a recipe of oil and vinegar in the hair, shower cap, and leave on for a couple of hours to drown the lice. This didn't work at all. The commercial pesticide shampoos and herbal shampoos did not work either. The only thing that worked for me was manual removal with a metal lice comb.http://www.mercola.com/1999/archive/..._head_lice.htmhttp://www.mercola.com/2003/mar/1/head_lice.htmhttp://www.mercola.com/2003/jun/21/head_lice.htm
Also, DH saw something on the news recently about dry
air being deadly to lice. A warm blowdrier might work well if used many days in a row.