Editing Human tooth (section)

====Discoloration====
{{Main|Tooth discoloration}}
[[File:Tired teeth.jpg|thumb|Discolored teeth]]
Discoloration of teeth may result from bacteria stains, tobacco, tea, coffee, foods with an abundance of [[chlorophyll]], restorative materials, and medications.<ref name="neville63">{{harvnb|Neville|2002|page= 63}}</ref> Stains from bacteria may cause colors varying from green to black to orange. Green stains also result from foods with chlorophyll or excessive exposure to copper or nickel. Amalgam, a common dental restorative material, may turn adjacent areas of teeth black or gray. Long term use of [[chlorhexidine]], a mouthwash, may encourage extrinsic stain formation near the gingiva on teeth. This is usually easy for a hygienist to remove. Systemic disorders also can cause tooth discoloration. [[Congenital erythropoietic porphyria]] causes [[porphyrin]]s to be deposited in teeth, causing a red-brown coloration. Blue discoloration may occur with [[alkaptonuria]] and rarely with [[Parkinson's disease]]. [[Erythroblastosis fetalis]] and [[biliary atresia]] are diseases which may cause teeth to appear green from the deposition of [[biliverdin]]. Also, trauma may change a tooth to a pink, yellow, or dark gray color. Pink and red discolorations are also associated in patients with [[leprosy|lepromatous leprosy]]. Some medications, such as [[tetracycline]] antibiotics, may become incorporated into the structure of a tooth, causing intrinsic staining of the teeth.