Why does my tongue burn when i finish eating some pineapple?

Answer 1

What makes this fruit particularly different is that pineapple has an enzyme called Bromelain. This enzyme 'eats' away at the gums, tongue, and roof of the mouth. Many people believe that letting the pineapple sit out all night, and taking out all of the core can take away some of the irritation.

Answer 2

because you burned it