IMO, you can't just comb through and see everything. There are zillions of hairs on the head. It's impossible to find everything in there. The ONLY thing that worked for us was using a method another MDC momma posted on an archived thread. It's called the Bug Busting Method. You only need a nit comb, shampoo, conditioner, and paper towels. There's a video that shows you how to do it HERE. It's the little box on the main page there. I did this every day to all of my kids and myself for a week. Then when I found nothing at all the last time, I repeated it again 3 days later, then another 3 days later for two weeks. I never found another nit, lice, or anything.
I bagged up most of the clothes in the house along with all stuffed animals/dress up clothes/towels/sheets etc. Everyone got one set of sheets, one towel, and enough clothes to last 7 days. I kept the other stuff bagged for a month. I did a load of laundry daily on hot and dried it on hot. I vacuumed the mattresses, couch, carpets etc. I put garbage bags over the pillows and slid the pillow case on over it for a month. This was after I dried the pillows on hot (but didn't wash them, they would have been lumpy then). It was crinkly sounding but everyone got used to it quickly.
Did I go overboard? Maybe. But all I know is we haven't had an issue since and that was enough for me. I did find dead lice inside some of the plastic bags with clothes in them when I opened them up a month later so I feel good about my choices. It wasn't easy (particularly because I was almost in my third trimester of pregnancy at that point), but I'm just glad it's over.
I hope this helps!