Yeah, apparently some lice (and bedbugs) are getting immune to chemicals that normally kill them, which is A Problem... except you can use listerine to smother them and then a fine tooth comb (a nit comb) to get the eggs out (to pick out the nits, or nit pick, if you will). Or I can just buzz his head. IF lice happen. I'm not super worried about it. Lice are more of an annoyance than dangerous, in general.