For the record, here's what Kurtzman & Orci had to say:
INTERVIEWER: I heard that the gold tooth was Michael Bay's idea, but do you have any response to those who found the The Twins offensive?
ORCI: Number one, we sympathize. Yes, the gold tooth was not in the script, thatís true.
KURTZMAN: Itís really hard for us to sit here and try to justify it.I think that would be very foolish, and if someone wants to be offended by it, itís their right. We were very surprised when we saw it, too, and itís a choice that was made. If anything, it just shows you that we donít control every aspect of the movie.
INTERVEIWER: Were you offended by them?
KURTZMAN: I wasnít thrilled. I certainly wasnít thrilled.
ORCI: Yeah, same reaction. Iím not easily offended, but when I saw it, I thought, ĎSomeoneís gonna write about that.íĒ