What it is:
Dimethicone is the heaviest silicone used in cosmetics.
What it does:
Dimethicone is a skin conditioning agent. It forms a protective layer on the skin and hair that seals in moisture, leaving them soft and smooth.
Dimethicone also adds shine to hair and improves combing and detangling, thus reducing breakage.
Dimethicone can buildup on hair. However, shampooing your hair regularly easily removes it.