“Why do the head lice products also ask you to nit comb?”
Head lice products also ask you to nit comb because they aren’t as effective as they say they are against the eggs. If you don’t get all the eggs out then they will hatch, the lice will grow up, mate, lay more eggs and you are back with a full blown infestation on your hands.
Nit combing is the most effective way to deal with the eggs. Don’t rely on the poor quality free nit comb in the product box either because their teeth are not close enough together and it won’t pull out all the eggs which is essential. Get yourself a good quality, long toothed metal nit comb and some conditioner and get the lice and nits out that way – much more effective!