00b95438_Community_Hygiene_Concern__False
[True] The product may kill the lice but not the eggs. A louse may be ready to leave the head in 6 days after hatching, so always check on day 5; some eggs may hatch between doses and some on days 9,10 and even 11, so check again on day 12. [False] 
There is no need to check that a treatment has worked when using products which kill lice in two doses a week apart.
Community Hygiene Concern
False