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I've occasionally wondered what food would taste like if you could selectively (and temporarily) disable the sweet taste-buds on your tongue. Same with salt taste-buds.

Perhaps numbing your tongue would work? A dentist could do that, but you'd only want to numb the surface. Is white coke (the illegal kind) a topical anesthetic?

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You can buy topical anaesthetic for mouth use from most pharmacies. Have a look at for example "oragel"

(http://www.orajel.com/)

There are "miracle berries" that make sour foods taste sweet.

It'd be fascinating to try something that took the sweet out of sodas. Someone posted a link to the OpenCola project in this thread. It's probably possible to make a batch with no, or much less, sugar than regular coke.

There are compounds that specifically inhibit sweetness perception: https://en.wikipedia.org/wiki/Lactisole

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