Changes

==Introduction==

==Introduction==

[[File:Dental discoloration.jpg|right|200px|thumb|Tooth discolouration following trauma]]

[[File:Dental discoloration.jpg|right|200px|thumb|Tooth discolouration following trauma]]

The normal colour of teeth varies and depends on the shade, translucency and thickness of the [[Enamel Organ#Enamel|enamel]].  

The normal colour of teeth varies and depends on the shade, translucency and thickness of the [[Tooth - Anatomy & Physiology#Enamel|enamel]].  

Teeth can discolour following trauma to the tooth. It can be any colour from pink to black, resulting from the haemoglobin breakdown products settling in the dentinal tubules. Studies show that 92% of discoloured teeth have irreversible pulpitis. The pulp may then get secondary infected by anachoresis.  

Teeth can discolour following trauma to the tooth. It can be any colour from pink to black, resulting from the haemoglobin breakdown products settling in the dentinal tubules. Studies show that 92% of discoloured teeth have irreversible pulpitis. The pulp may then get secondary infected by anachoresis.  

There are two basic kinds of discolouration:

There are two basic kinds of discolouration:

:'''Intrinsic staining''': secondary to endogenous factors discolouring the underlying [[Enamel Organ#Dentine|dentine]]

:'''Intrinsic staining''': secondary to endogenous factors discolouring the underlying [[Tooth - Anatomy & Physiology#Dentine|dentine]]

:'''Extrinsic staining''': from surface accumulation of exogenous pigment

:'''Extrinsic staining''': from surface accumulation of exogenous pigment