I Found Moving Head Lice On My 7 Year Old. Treated Her With Medicated Shampoo.?

After shampooing I used the small toothed comb. I got about 20-30 moving head lice out of her hair. Shouldn’t the medicated shampoo killed off the head lice? I brushed her hair for over an hour, but I am afraid there are still some on her head. What [...]