As parents there are thousands of us who think leaving your child with head-lice is a sort of child abuse. Where I am sorry to say there is a minority that do not really care. Where we treat our children to stop infestation the minority do not. Which causes them to be infested with head-lice. Causing them to be continually scratching. As to be continually scratching they cannot concentrate when trying to learn in school. Which means grades will drop. Please help these children be free to concentrate in schools so they grades do not fall behind.