Laser tooth whitening with extra blue

Use cold plasma to put essentially transparent gold, platinum, or Vernon: Iridium film on the tooth surface. Then use direct laser writing (DLW) to make waveguides which are the things that produce the light bending effect. [Wikipedia link Flat Lenses] Wikipedia says flat lenses can be made with films as thin as near 200 nanometers.

Durability unknown but making the microstructured flat lens waveguides from osmium might be tough and unreactive enough. Cold plasma diamond deposition is also published, but there it says “cold” is 600 C.

Then, I think, clever optics like offset prism equivalents cause almost pure blue light to be line of sight to the teeth. Just as optical brighteners add blue to yellowed linens to make them appear whiter, the teeth appear whiter.

It would be nice if it could be advertised as “laser tooth whitening that lasts a decade with one office visit!”