Gum boils:

If you can get over the shock of waking up to a mouthful of black saliva, placing a charcoal tablet against the boil and leaving it there to dissolve overnight could help absorb the toxins from the affected area. The amazing powers of tea tree oil can also stretch to gum boils. One drop of the good stuff in half a cup of warm water, and gargling with it twice a day for three weeks, should do the trick.