Third, treat your child's head. Treat everyone else in the family too - even if you haven't actually found evidence of head lice. Check with a pharmacist, the school nurse or the school office what treatment is being recommended. The recommendation does change from time to time, so you need to make sure you get the right thing. It might be a lotion, which you leave on the hair for up to 12 hours, or it might be a special shampoo, which you use like any other.
Some treatments are unsuitable for pregnant women, very young children or asthmatics.
There are alternatives, so check that you have the right one. Finally, some treatments are best if repeated after seven days. Check the instructions carefully. Don't treat your child on a regular basis to try to keep head lice away. It probably won't work, instead it will just help the head lice to build up resistance.