how long does it take for lice to show
If head lice show up again after you treat, it is usually because nits or newly hatched head lice were not removed. This happens often, because some of the lice are so small that they can only be seen under a microscope. Treating head lice is a long process that can take up to 21 days.o get rid of head lice, you must do two things: kill the live lice on the head, and remove all the nits (head lice eggs) from the hair. This involves three necessary treatment steps: 1  Careful combing of the hair (nit-picking). 2  Medications. 3  Treating the house.
One of the biggest causes of re-infestation is not getting the lice out of your environment. Lice will live up to 48 hours off your head, and nits will survive for up to 10 days on your sofa, your car seats, your bedding, etc.You must treat your head and your home environment to end a lice infestation in one day, and stop it from coming back.ne of the biggest causes of re-infestation is not getting the lice out of your environment. Lice will live up to 48 hours off your head, and nits will survive for up to 10 days on your sofa, your car seats, your bedding, etc.