fireÂ·bomb (fÄ«râ²bÅmâ²) n. A bomb used to start a fire; an incendiary bomb. v. fireÂ·bombed, fireÂ·bombÂ·ing, fireÂ·bombs v.tr. To attack (a target) with a firebomb. v.intr. To launch an attack against a target, using a firebomb. fireâ²bombâ²er n. firebomb (ËfaÉªÉËbÉm) n (Firearms, Gunnery, Ordnance & Artillery) another name for incendiary 6. vb (tr) to attack with incendiary bombs. ËfireËbomber n. fireâ¢bomb (ËfaÉª É rËbÉm) n. 1. an explosive device with incendiary effects. v.t. 2.
Gum discoloration of this type is called an amalgam tattoo, which is caused when tiny pieces from a filling or cap wedge themselves into the gums. This issue often looks like a blue or black tattoo in the mouth, and it too is harmless. Smoking, certain medications such as minocycline, antimalarial agents, or tricyclic antidepressants, or metal-based crowns or fillings may also cause gum discoloration.
Healthy gums are firm and have a lovely pink colour. When there is evidence of gingivitis (gum disease) they can become puffy, swollen and red. They can also bleed. There could be a number of reasons why gums appear dark/ pigmented or black. After having a silver filling (common in the UK- not sure about how commonly used they are in the rest of the world) some debris from the filling can be lodged in the gum and the gum can look dark blue/ black- this is called an amalgam tattoo and is harmless.