Lice are usually killed with proper treatment. However, lice may come back, especially if the source is not corrected. For example, a classroom with many infected children can cause kids to repeatedly get lice. When one case is detected in a family or a school or child-care center, every child at that location should be examined for head lice. This can help prevent further spreading.
What to expect if I have Pediculosis capitis  (Outlook/Prognosis)?
Lice are usually killed with proper treatment. However, lice may come back, especially if the source is not corrected. For example, a classroom with many infected children can cause kids to repeatedly get lice. When one case is detected in a family or a school or child-care center, every child at that location should be examined for head lice. This can help prevent further spreading.