When we put something in our mouth, whether it's a drink, food or chewing gum, there tastes linger for a few minutes after we've finished chewing them. However, the flavours we experience in our mouth aren’t always from food or drink, and there are cases in which we’ll have a metallic taste in our mouth which doesn’t pass even after a few hours or, sometimes even weeks or months. There are several reasons behind this phenomenon, some of which are our fault and some are due to environmental circumstances, and it is important to know them.

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