Just an update to this, I've been soaking my tusks in tea for the past 2 days and they came out great. Being as they are made of friendly plastic and molded by hand, sanding was not necessary as they are not smooth and have quite a few imperfections that show up quite nicely as cracks in the teeth after soaking. Overall the pearly white of the friendly plastic has faded and they are now tinted with a brownish yellow and all of the cracks and grooves are a nice dark brown as though they are covered in plaque.
I would say this was a success and suggest it to anybody who doesn't like their bright white tusks being whiter than their own teeth :thumbsup: