When I'm looking at Armin Shimerman photos, I can see, that his teeth are in nearly perfect condition. Yet, I have never seen any Ferengi with straight, healthy teeth.
Do we have any off-screen information, how do they prepare actors playing Ferengi characters or how do they achieve the effect of Ferengi teeth out of actors having "normal" teeth?
I can see, that Star Trek's make up and characterization department is (was) doing really well, especially when it comes to characters like Morn played by Mark Allen Shepherd:
But, even with this evidence, I can imagine how do they get characters with holes in teeth or with triangle-like teeth out of actors having straight, rectangle-like teeth.