No, the teeth colourMap is like any other. Diffuse(.85). Diffuse() should never be set to 1, according to BB. What I did end up doing was to move the Clay node: it's now Blender-paired with the ImageMap, output is then linearised, then it goes into a CoE-ed Diffuse node set at .85, and that's added to specular before gamma-correcting. Like so:

which changes this:

to this:

I can live with those teeth... those shadows are acceptable.

ETA: sorry to hijack your thread... we can go back to lycra, now.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks