The general rule of thumb is after you have treated for head lice and have no more nits. Lice have a life cycle of 21 days.
All of our All Stop Liceadex Head Lice Treatment Systems come with fine tooth combs for your convenience.
It is not required that a nit comb is used with our one step head lice treatment system. We do provide a fine toothed comb in our packaging for your convenience.