So, screw that pesticide crap anyway, and ditch the comb. Get yourself to a licensed AirAllé / Lice Clinics of America and (as long as you're old enough and don't have contraindications) get the hour long heat treatment. Assuming you can avoid reinfestation (like from family members, so maybe have everyone done at once, or at least be assessed), it's one-and-done, and there's no reason to believe lice, "super" or otherwise, are going to evolve some sort of resistance to desiccation.
Inconveniently, the Seattle area option is on Bainbridge. There are numerous Boston area options. The Lice Clinics of America has a finder feature on their website.
There are lots of other things you can try, of course, but this is the first time I've ever run across anything that has had clinical testing (FDA approved!) and a guarantee.
ETA: Standard advice is to quarantine clothing and bedding for some unreasonable amount of time and/or run it through a dryer on high for 30 minutes to an hour. Judging by Ms. Flynn's research on ticks, I'm betting the already VERY low risk of reinfestation of lice from clothing and bedding can be reduced to zero with a lot less time than that in the dryer. 10 minutes on low will probably do it.
Re: my husband's remark about shaving his head. Yeah, sure, but he does that occasionally anyway. _I_ would shave my head, too (at this point, I'm just looking for a good excuse anyway). But asking children or people with long hair to do so is probably cruel.