According to the EU Cosmetics Directive,
CI 77891 Titanium Dioxide as a cosmetic colorant is unrestricted.
Titanium Dioxide has a 25% maximum use restriction as a UV filter.
This is a totally different regulation than cosmetics.
There are the separate annexes for titanium dioxide.
In Annex IV for cosmetic colorants - see #143
In Annex VI for UV filters - see #27.
We use titanium dioxide as a colorant in the nailpolish, not as a UV filter.