I know this is an old post, but I'd like to say that it is not unsubstantiated scaremongering. If you have titanium in your body from dental implants, surgical staples, root canals, or metal plates, your immune system will try to get rid of the foreign object until the object is actually removed. If you ingest titanium dioxide you will feel like you are going to die. It is generally called titanium staples allergy.
27 years ago i had an ovarian cyst removed and they closed with titanium surgical staples ... they are still in my body ... I've been sick for 24 years now. I have a dozen autoimmune diseases. My immune system reacts to everything at this point … even water.
Here in the usa titanium dioxide is in everything … not just sunscreen.
It is a real problem for some people and it is NOT easy to avoid. Once I started looking for it in the inactive ingredients on the labels of my vitamins and supplements I found it in almost all of them. It is very hard to avoid.