Hedrin Once has been clinically proven to kill lice and eggs in one go.
Nits may remain after lice have gone. They are empty eggshells and stick strongly to hair. They will eventually fall out. If you prefer, a fine-toothed 'nit comb' can remove them.
When using Hedrin® on broken skin, slight irritation may occur. Sometimes application may cause flaking of the scalp, itching, irritation around the eyes and hair loss. If you notice any of these or other side effects, stop using the product and talk to a doctor or pharmacist.