Final answer:
The nurse should instruct the client to inspect their hair shafts daily for nits after using lindane (Kwell) for head lice treatment, to prevent reinfestation.
Step-by-step explanation:
The nurse should reinforce instructions to inspect hair shafts, checking for nits daily, for one week following treatment with lindane (Kwell) for head lice. This is important because lice eggs (nits) can survive and hatch if not removed properly. By checking for nits daily, the client can ensure that any remaining eggs are removed and prevent reinfestation. It is also essential to comb through the hair with a fine-toothed comb to remove any dead lice and nits.