While many celebrities opt for American-style treatment to get their teeth polished, experts believe that the perfect smile that they achieve may seem to be too symmetrical and artificial.
However the pioneering work done by French dentist Dr Didier Fillion allows his patients to retain the asymmetrical nature of the teeth and thereby providing a beautiful and natural smile.
Dr Fillion's close friend, Bernard Touati said that he had worked on the Duchess' teeth which involved "micro rotations" of the teeth in order to provide an improved but natural smile. "The problem in the United States is they have very artificial vision. But what we like is a natural healthy smile, but not artificial," he added.
Other celebrities who have undergone the same treatment include Kelly Brook and Sadie Frost, the Mirror reported.