Titanium dioxide is a chemical used in toothpaste to
Titanium dioxide is a powder that is used as a dye in foods, and in objects and it is what gives toothpaste its white color.It does not react with anything and will not harm you.MedTq367 Â· 7 years ago. Thumbs up.itanium dioxide is a powder that is used as a dye in foods, and in objects and it is what gives toothpaste its white color. It does not react with anything and will not harm you. MedTq367 Â· 7 years ago. Thumbs up.