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Gum disease is a very common condition where the gums become swollen, sore or infected. The gums tend to bleed after you brush or floss your teeth, and the blood in your mouth causes the metallic taste. If left untreated, the tissues and bone that support the teeth can also become affected (known as periodontitis).
The iron that is released as blood breaks down in the mouth can leave a strong metal taste behind. To prevent this from happening, combat dental disease and bacteria by scraping your tongue, brushing your teeth twice a day and flossing regularly.