5. Olive oil could do the trick
All types of oil are highly viscous, which means that they have the ability to suffocate and kill off head lice. This includes olive oil. Plus, olive oil also has properties that make it act as an insecticide, which makes it even more effective for killing lice. To use olive oil to treat head lice, apply a generous amount to your head. Work it into your scalp and hair. Leave the oil on and wrap your hair in a towel or put on a shower cap, leaving in place for 30 minutes. Comb through your hair with a fine-tooth comb to remove the dead parasites. Wash your hair with your normal shampoo to remove residue left behind.