Yes, your hair will definitely grow back after lice. Lice are parasites that feed on the blood from the scalp and cause an itchy scalp and visible eggs in the hair. Although they can be a nuisance, they do not cause any permanent damage to your hair follicles or scalp. In fact, if you take care of the infestation quickly and correctly with medicated shampoos or other treatments prescribed by your doctor, then you should see normal hair growth return soon afterwards. However, it is important to note that even once all of the lice have been eliminated, some people may experience temporary thinning due to irritation caused by scratching during an outbreak – this usually resolves itself within a few weeks once the itching has subsided.