First, do a thorough check of your children’s hair and scalp to look for live lice. If you don’t see any, then you may be able to just try and remove the nits on a regular basis and continue to look for live lice. Since most of the anti-lice medications are not ovicidal, meaning they don’t kill the eggs, treating a child with just nits may not be necessary.
Nits are more likely to contain a live embryo if they are close to the scalp.