Question: how long after lice treatment can you find eggs?
Answer: Don't Obsess Over Nits “A good rule of thumb is this: If no live crawling insects are seen three weeks after the treatment, it's safe to assume that you are in the clear,” Dr. Cohen says. If nits were alive, they would have hatched by now. Nits and their shells may remain in the hair for some time but won't be viable.