NITS & LICÉ REMORTS

Adult head lice can survive on a hairbrush for up to two days, and nits can survive for about a week. To kill lice and nits, you can soak hairbrushes in hot water that's at least 130°F (54.4°C) for 5–10 minutes. 

Finding eggs (nits) without lice does not necessarily mean that there is an active infestation; nits can be found for months after lice are treated. Because lice lay eggs at the base of the hair shaft, the identification of nits within ¼ inch of the scalp suggests (but does not confirm) an active infestation.