In my circle, Dextomax is considered one of the best. Cydectin the worst.
There is no product that can guarantee lice kill unless you treat twice, once and then again in 2 weeks. "The way to get lice is to pour them twice." That is what the parasiteologists say. Do you ever wonder what happened to the lice guarantee on all these products?
I can tell you. The government made the manufacturers pull them because it was bogus. It was marketing, pure and simple.
We have a friend that worked for Ft. Dodge selling Cydectin. She lost
her job because of the government pulling the guarantee. That's how
I found out. She told me. It took their marketing tool away.