SirChenjin
Forget the treatments, they often don't work - combing small sections of hair using a nit comb and lots of conditioner is the best way of dealing with them. The NHS website recommends 1, 5, 9 and 13 to catch any newly hatched head lice and then checking again that everyone's hair is free of lice on day 17.
Or even baby oil, which is also a good treatment for hair.
Wet the hair, rub in some baby oil, brush through then get that nit comb through it!
Once finished, shampoo as normal.
This is a bit like the hot oil treatments. And you can see more of the little buggers in the oil!
Remember to let the school & other parents know that you have treated the children!