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I recently seen a dentist for my filling, I for the first time paid attention to what he was doing I guess, because the material he used for my filling was easily deformable before he put it on my teeth (like clay), however it was/and still is pretty solid in my mouth.

Conjecture

  • I've seen him using ultraviolet laser, I presume he excited the material with UV somehow thus changed the state of the material, yet I don't know how.

I've done some search on internet yet couldn't find anything relevant.

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Composites are placed while still in a soft, dough-like state, but when exposed to light of a certain blue wavelength (typically 470 nm[6]), they polymerize and harden into the solid filling (for more information, see Light activated resin)

https://en.wikipedia.org/wiki/Dental_composite#Method_and_clinical_application

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