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Our tooth colour is genetically determined. The '
'shape and position of the teeth also influence '
'perception; large teeth and a harmonious tooth position '
'appear "whiter". The colour impression is created by '
'light reflection, partly on the outer surface of the '
'whitish translucent (transparent) enamel, partly inside '
'the tooth at the transition to the yellowish dentin '
'
. The enamel is thicker in the area of the '
'incisal edge than at the tooth neck and is therefore '
'whiter, but also more transparent. At the neck of the '
'tooth and the transition to the gums, many teeth appear '
'somewhat "yellower" due to the dentin shining through. '
'
As we age, the enamel becomes continuously '
'thinner and the teeth consequently yellower. In '
'addition, discolouration on the teeth due to plaque, '
'food residues, lifestyle habits (coffee, tea plaque), '
'tea residues (smoking), etc.
Furthermore, '
'mineral disorders occurring during the formation of '
'tooth enamel, fluoride overdoses (e.g. dental '
'fluorosis) or deposits, e.g. as a side effect of '
'medication (e.g. antibiotics such as tetracyclines), '
'can
lead to whitish, yellow or brown colour '
'stains
. fluorosis) or deposits, e.g. as side effects '
'of medication (e.g. antibiotics such as tetracyclines), '
'can lead to whitish, yellowish or brownish colour '
'stains, which can often also be associated with '
'structural anomalies such as grooves or stippling (e.g. '
'molar incisor hypomineralisation). Such colour deposits '
'can also be found in the dentin. Furthermore, leaking '
'fillings or crowns, for example, can cause cracks in '
'the teeth, which can promote the penetration of '
'unsightly (yellow or brown) colouring into the outer '
'tooth structures.
Traumatic haemorrhages, e.g. '
'after an accident (at least temporary blue '
'discolouration of the teeth) or brown-black dyes from '
'dead pulp (dental nerve) tissue (see above) or by '
'release from root canal filling materials can lead to '
'translucent brown-black tooth discolouration from the '
'inside of the tooth (the former pulp cavity).
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'text': '
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What to do if the tooth is discoloured from the '
'inside?
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Internal tooth discolouration can indeed occur, for '
'example, due to the death of nerve tissue (pulp) inside '
'the tooth or reactions from (root canal) filling '
'materials. Some of these are also congenital, caused by '
'side effects of medication or accompanying symptoms of '
'malformations.
The usually dark, blackish-grey '
'discolouration of decayed pulp tissue can often be '
'bleached very successfully from the inside out. The '
'dentist first checks the root canal filling, which '
'often needs to be replaced before internal bleaching. A '
'permanent bleaching agent is then placed inside the '
'tooth over a period of several days to a week and the '
'tooth is sealed. This so-called walking bleaching '
'technique involves a continuous release of oxygen from '
'the bleaching agent over many hours, which penetrates '
'the pores of the tooth from the inside and can break '
'down and oxidise the colouring agents. Once the '
'bleaching agent has been removed, the tooth is sealed '
'tightly and the bleaching is therefore stable for a '
'very long time in most cases.
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