Denture ice cube trays
I don't care what these people say: There's no way these taste as good as real dentures.
(Available at fine gag retailers and tacky cocktail parties everywhere.)
Frozen Smiles product page [WorldWideFred.com via Technabob]
Previously • Tetris ice cube trays
• Banana clip tray makes ice bullets

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My dentist friend gave me some of these. They're great! They're very realistic -- I assume that they're molded from a real person's mouth. I just wish they could be personalized...
I gave these to my mom for her 50th birthday last month. She was not impressed.
I wuv beez!
I have these. As long as you're careful removing the ice teeth from the mold they're great. Otherwise they tend to break in the thinner non-teeth area.
These look especially good in a fizzy drink, served in a short, clear glass...
Found them at: http://www.zgallerie.com/p-6567-frozen-smiles.aspx