#3 - I like the colors and design. It is just hard to determine at first glance that it is a tooth. Very nice start. I like the creativity of your other designs, but they are feminine and you can not tell that they are teeth.
#24 is really nice. We need the white whiter on the logo. I want to be able to use the logo by itself to represent the brand and think that without my name most people will not see that it is a tootth. It looks like a heart. This is esthetic, but could be modified to have the counter curves of a tooth. More masculine.
#80 is a nice logo. Do you have anymore abstract ideas that are not obviously teeth? I have no solid entries of this kind and I feel that I am missing a large segment of designs.