One that changes color the longer you brush so that you know you've brushed sufficiently (and not just blood-red to indicate your gums are now bleeding).
One that changes color based on where the calculus on your teeth accumulated, so you can target you brushing.
One that does the brushing for you, just keep it in your mouth for 3 minutes and rinse.
Trader Joe's peppermint anticavity toothpaste. Was a bit odd at first as it has baking soda in it, but after a tube or two I think regular toothpaste is really the odd tasting one now. Cheapish.
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