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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).
A metallic taste in your mouth is a type of taste disorder known medically as parageusia. This unpleasant taste can develop suddenly or over longer periods of time. To understand what causes a metallic taste you must first understand how taste works. Your sense of taste is controlled by your taste buds and your olfactory sensory neurons.