Recently, I had a strange reaction to Sensodyne Whitening and Gum Sensitivity toothpaste. As luck would have it, I happen to fall into the subset of the population that lose much of their ability to taste certain flavors after using the toothpaste for a couple of days.

I happened to catch on pretty quickly and ended up switching toothpastes within the week, but it still resulted in about two weeks where I could not taste salt, and could hardly taste anything sour, sweet, or whatever makes buffalo sauce taste like buffalo sauce. It felt like I was coating my mouth with flavorless lard, in case anyone was curious.

What I found most fascinating about this experience came after my tongue recovered. Despite only having lacked those tastes for about two weeks, my perception of them became a lot stronger -- apple juice, which I previously would not have called sour, suddenly seemed to have a bit of a twang to it (which is to say nothing for how sweet it was). The taste of salt, surprisingly, did not become overwhelming without amounts that I'd regularly consider to be a lot.

I suppose that this shouldn't be particularly surprising -- this happens with vision. For example, staring at the color yellow, and then looking at a black background will show you a stygian blue, which is impossible to perceive normally. Still, I find this interaction fascinating, and have to wonder what might happen if I were to blind myself for a couple of days, or deprive myself of sound or smell. I must also note that it's incredibly disappointing that I will likely never taste apple juice in that way again, it was probably one of the best drinks I've ever had.