I used to work in a family literacy program and did head checks on kids every Monday. *Sigh.
Spring clean, wash everything, blankets,coats, carseat covers, hats, gloves, mittens, vacuum everything and run to the Drug store for a nit kit. Some parents swore by oil in the hair for a few days, not sure that worked. Also had some say Suave coconut shampoo kept them at bay during school years.
Call your local CPS, they give kits out if you qualify, they can be expensive.
Nits look like little/tiny pieces of white rice STUCK on a hair shaft,if you run your finger along it and it doesn't move, you've got a nit.
Don't be horrified, it's common with kids in school, not the end of the world, a pain in the ass for sure but it'll be ok!!
my kids have had it 3 times. i usually get the treatment kit from walmart (equate brand) or RID (but it's pricey). what i do is treat their hair, comb it out with the special comb. then about 2 days later, i comb through their hair again. but instead of using the expensive treatment junk, regular dollar store conditioner (like suave, white rain or vo5) works the best cuz it's so thin. then i wait about 3 or 4 more days, depending on how bad it was, and comb it again with the conditioner. usually it's gone by then but i just do it to be on the safe side.
if you comb it through the 1st time and don't find any bugs, it's still gonna be there. you can't have nits without a bug, so there's gotta be at least 1 or 2 roaming around. it's a pain in the ass...on the bright side though, lice are attracted to CLEAN hair, so at least you know your kids have clean hair!