Read:

http://www.dentalbuzz.com/2014/03/04/crest-imbeds-plastic-in-our-gums/

The list that you see there is not complete, all or just about all 3D Crest and maybe even most or all Crest toothpastes have plastic in them, the H.E.B. Texas toothpastes that copy Crest 3D also have the same plastic in them.

If you use a search engine you will find more of the same at many other sites, it seems to be a real problem, no don't ask doctors about this, many of them might either not know and or not care.