The Nix Premium Metal 2-Sided Lice Removal Comb has a smaller tooth side ideal for straight hair and for removing lice and their eggs (nits), while the wider tooth side is designed to tackle tight curls, snarls, and tangles. The comb is effective to remove head lice and their eggs (nits), which is an important part of treating head lice. Use with Nix Lice Killing Creme Rinse or Nix Ultra 2-in-1 Lice Treatment. For best results, hair should be free of styling product, i.e. gels or mousses. Before treatment, comb the hair thoroughly with a regular comb to free all knots. The tines of the lice comb are purposefully very close and may have difficulty getting through the hair if it has not been properly combed.