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Nix Ultra, Kills Lice Pesticide Free is a pesticide‑free, non‑toxic head‑lice treatment that works by suffocating lice—including resilient “superlice”—through a coating action of dimethicone and isoparaffin rather than using harsh chemicals; it comes with a fine‑tooth lice removal comb to physically eliminate lice and nits after treating and shampooing, and is gentle on the hair, fast‑acting, and trusted as a pediatric‑recommended solution.