ToonPro is nice because you can set global line/cel parameters but then override them on an per domain basis. In this quick example, I set the main line color and width and then changed it for the teeth and gums. 

However, if you don't want all shaders or domains to be "tooned", you can override the global setting and turn off the look. There is also a special Toon shader control in the Shader Room for more finessing.

Additionally, ToonPro respects texture maps but does a nice cel coloring job on them. For flat color objects, it quickly creates even more "cel" like results.

Works fine on DAZ/Poser Content. I've never regretted getting - I've actually created some television commercials with it. ;-)

Mark