First I find it here, and as it claimed to be real tooth that Colosseum was carved into, I've done a little research and discovered that it is toothpaste advertisement campaign, which was to convey this “Roman Civilization Cavity”, i.e. not to let germs settle down on your teeth, or else you will have to end up with such a “Colosseum” cavity.
The two CGI sculptures related to Civilization-Egypt and Civilization-Rome.
Therefore, the CGI picture neither shows a real tooth, nor a colosseum
carved into it. It is not so amazing fact, but a good health campaign