1, eating pineapple can cause tongue pain, which I believe will happen to many people. Because pineapple pulp is rich in vitamin C or organic acids, such as citric acid or malic acid, there will be a pineapple enzyme, which can decompose protein.

2, many people have a sore tongue when eating pineapple, which may be because they have not been soaked in salt water. Because we eat it without soaking it in salt water, this enzyme will stimulate the mucosa of our mouth and the epidermis of our lips. Because of these stimuli, it causes the irritation and pain of oral mucosa, so it will feel tongue pain. Put salt in it, and the pain will disappear, because salt can inhibit the activity of pineapple enzyme.