I have compared the vanilla MATs for Genesis 9 and my go-to Uber Shader settings for teeth.
Vanilla:
MAT 01
MAT 02
Iray Uber Shader:
Colour Variation 01 (Additional translucency map and colour injection)
Colour Variation 02 (No map, only colour injection in the translucent channel)
My baseline Settings for Uber Iray Shader (adjust accordingly for any given model and used colour maps): The foundation of these settings isn't mine. I found some good documents in the "photorealistic discussions over at the DAZ Forums and adjusted them accordingly to my liking.
Base Color: RGB 255, 255, 255 + Colour Map
Translucency Weight: 0.70
Base Color Effect: Scatter & Transmit
Translucency Color: RGB 241, 241, 253 //This is the most important part of the colouring. If you inject a map use only those you would also use for the base colour not the diluted ("translucent colour") one, often shipped with a product as well.
SSS Reflectance Tint: RGB 254, 254, 254
Glossy Layered Weight: 1.00
Glossy Color Effect: Scatter & Transmit
Glossy Reflectivity: 0.718997
Glossy Roughness: 0.20
Refraction Index: 1.631
"Measurement of the refractive index of human teeth by optical coherence tomography"
Zhuo Meng, X. Steve Yao, Hui Yao, Yan Liang, Tiegen Liu, Yanni Li, Guanhua Wang, Shoufeng Lan
Journal of Biomedical Optics, Volume 14, Issue 3
[J. Biomed. Opt. 14(3), 034010 (June 03, 2009). doi:10.1117/1.3130322]
Refraction Weight: 0.14
Normal Map: 1.00 // Depending on the scene you can dial up to 2.00 for more pronounced details in Mid or wide shots.
Transmitted Measurement Distance: 0.10
Transmitted Color: RGB 251, 249, 247
"Translucency of Human Dental Enamel"
R.H.W. BRODBELT, W.J. O'BRIEN, P.L. FAN, J.G. FRAZER-DIB, and R. YU
Surface Science Laboratory, Dental Research Institute, University of Michigan, Ann Arbor, Michigan
[J Dent Res 60(10):1749-1753, October 1981]
Thin-walled: OFF
SSS Mode: Mono // if you use chromatic the SSS Amount setting will be replaced by a colour injection
Scattering Measurement Distance: 0.10
SSS Amount: 0.99 // In chromatic this setting changes, use off-whites accordingly to your model.
SSS Direction: -0.35 //changing the value between -0.25 and -0.40 can help with issues through stronger lights