Kate Middleton smile charms the watching world.

But did you know that Kate Middleton's beautiful smile comes from an Orthodontist who works in London, Geneva and Paris.

Dr. Didier Fillion, the French-born orthodontist has specialized in invisible braces and has the Royal Princess as a patient.

Kate visited Fillion Wimpole Street consulting rooms for a teeth makeover. Fillion applies braces to the back of the teeth where they could not be seen.