Dimeticone is a silicone compound, widely used in the cosmetics industry, which is highly effective against head lice.

Hedrin also contains Cyclomethicone 5 which is a carrier ingredient that evaporates after application leaving the active ingredient to kill the lice.

Head lice cannot jump, fly or swim and can only be acquired by direct head to head contact. This is why lice are commonly found on the heads of children and those in close contact with children and is why it is important to check the heads of all the family members when head lice are found.