NOW I am really itchy! Ahh, the power of suggestion! The nits MUST be removed carefully OUTSIDE your house preferably, but if inside, spread out a plastic disposable table cloth over the area where you are checking. This is a TEDIOUS and time-consuming process. Don’t try to rush it, or you will miss some nits and they will hatch, thereby restarting the whole cycle. Nits look like pearlized droplets on the hair – very easy to miss unless you check every strand.
We went through this once many years ago. When some kids go away on trips outside the country or even summer camp, the places where they go are not so makpid about lice control, so the kids come back from winter recess or summer camp with head lice. They spread like wildfire. One louse can lay a LOT of eggs (nits). The follow up needs to be done for a few weeks. Oiling th head thoroughly helps to smother the live lice, but does nothing for the nits. I have heard a mayonnaise conditioning treatment helps to kill the lice AND make nit removal easier.
Whatever you do, now is the one time you are applauded for nit-picking.