Ok, let's remain scientific here. These women didn't say Elliot's teeth were the reason they voted for someone else. It is subliminal. It factors in. Sometimes imperfections actually enhance looks, as with the "wandering" eyes so prevalent among character actors in Hollywood. But for some reason the uneveness of his teeth is a negative. It is intangible, to be sure, but it exists, and he would be wise to fix it. Chris, KAtherine and Taylor have perfect smiles and symmetry. Elliot does not and it may hurt him when this whittles down to he and they as the final 4, as is likely.
I predict Chris will win, because he's straightforward, manly, and 100% believable.