You have a surface that has a color and texture, and sooner or later you get a scratch, nick, etc. in it.
A pen that can scan a small area of the surface you have the blemish in, so it can get the color and texture, and then “prints” the same color and texture in the blemished area, making the blemish disappear.
To help patients visualize how their teeth look like and where the problems are.
Have a software that takes the X-Ray and renders it in 3D, so the result looks less like a flat black and white photo of your teeth, and more like a color rendition of it. Colors can represent different conditions and facts.