Why does dentures or false teeth turn blue in a black light setting?

Dentures or false teeth can appear blue under black light due to the presence of certain materials or additives used in their fabrication, such as fluorescent agents. These materials can absorb ultraviolet (UV) light and re-emit it as visible light, often in the blue spectrum. Additionally, some acrylic resins used in dentures may contain dyes or chemicals that react under UV exposure, enhancing the blue appearance.