Most food-grade titanium dioxide is around 200–300 nanometers (nm) in diameter. This size allows for ideal light scattering, resulting in the best color (1Trusted Source).
Solids were stable and did not show visible signs or changes in their spectra after being kept at room temperature for over 60 days. The absorbance at the maximum absorbance wavelength remained unmodified.
A number of our toothpastes do not contain titanium dioxide, including some of our Signal products (Signal Bio, Signal Nature Element, Signal White System, Signal Kids (Baby & Junior), Signal White Now Detox, Signal Anti-Cavity), Love Beauty and Planet and Schmidt’s Naturals.
A safety review conducted by the EFSA in 2021 assessed thousands of studies published on titanium dioxide.
They are the only two sunscreen ingredients classified by the FDA as safe and effective. And though titanium dioxide is usually used in mineral sunscreens in the form of nanoparticles, evidence suggests that few, if any, particles penetrate the skin.
