Why does eating spicy food make other foods feel hotter?

Capsaicin is the ingredient in peppers that causes the spicy hotness. It's persistent and can coat your mouth and your hands (why gloves are suggested when handling peppers for cooking -- important to wash hands thoroughly before hitting the washroom and doing things such as changing a contact). It is believed that capsaicin is used to detour animals from eating the plant's fruits but that it doesn't bother birds which is fine because they eat the fruit and the seeds pass through unharmed to grow elsewhere.

From Burt Wolf's "What We Eat" show, episode 103, "Some Like It Hot" comes these explanations for the sensations you describe:

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"The chemical in a pepper that makes it hot is called capsaicin. It is a natural decongestant and an active ingredient in many common medications. Some authorities believe that hot peppers are addictive. They say that when the capsaicin in the pepper hits the nerve endings on your tongue your brain thinks your body is being attacked and

responds by delivering endorphins that are painkillers. The endorphins also give you a slight but pleasurable high similar to a very mild dose of morphine. Every time you take a bite of the pepper, you get another hit of endorphin.

...hot pepper will bring flavor to the meal because it has the ability to open the mouth’s flavor receptors, making your taste buds more sensitive.

Capsaicin isn’t soluble in water, so a cold drink won’t help, but it does dissolve in alcohol. One way to get the burning sensation out of your mouth is to rinse with a mouthwash of vodka. Do remember to spit it out.

And most amazingly, it seems to affect only the pain messengers. The nerves that sense heat, cold, pressure and other sensory messages remain active."

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As for mint, it's menthol which causes the cooling sensations:

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"[A] gene encodes a pore which sits in the membrane of a specific class of cold-sensitive nerve fibres. When the nerve is cooled down the pore changes shape, triggering the production of excitatory nerve impulses that are relayed to the brain. The pore is also activated by menthol, which provokes the pore to change shape at much higher temperatures than it would normally, explaining why sucking a mint makes your breath feel cold against the back of your mouth."

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its might be touchy tooth or mouth, average case for the folks, pricey... so use distinctive toothpaste and mouthwash daily so as our tooth much less that feeling (touchy...), and after consuming highly spiced meals, you'll drink scorching tea or scorching milk (dont drink the bloodless drink). well success and desire its support.