Please read these links about Titanium Dioxide by Safe Cosmetics
Note the concern is inhaled Titanium Dioxide.
and a source written by a science oriented person about Natural Cosmetics with several studies cited.
And here from the American Cancer Association about Fluoride:
"More than 50 population-based studies have looked at the potential link between water fluoride levels and cancer. Most of these have not found a strong link to cancer."
Please provide people with science backed info before you attempt to scare them.