Multicolor dental fillings

I’m visiting an exposition. The artist has made several installations where the use of saturated colours dominates. One piece consists of vases put next to each other, containing water in different colours: red, orange, yellow, green, blue, purple, … Another piece consists of big flames also neatly arranged next to each other. The fire is manipulated so the flames have the same colours as the water. There’s also a set of dentures (teethings?) where each tooth-filling has a different colour.