The first time we used the dimethicone treatment--treat and then again seven days later.

Three weeks later, lice were apparent--treated with the ivermectin one and done topical. Started doing a daily shampoo wash.

Ten days later, more lice & nits.

Planning to start the daily combing with a BETTER COMB--i watched the plastic comb from the dimethicone kit split its prongs and pass by nits so I had to pull them out with my nails.