Are teeth supposed to go slightly yellow at the age of 13 but then get whiter?

  • Thread starter Thread starter Guitar Hero rocks
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Guitar Hero rocks

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Because my mum said that she knows of other 13 year olds whose teeth went slightly yellow but the kids in my class all have pearly white teeth. i brush for 4 min every morning and night but they are slightly yellow. What can i do to make them white? Please help!!!!!!!!!!
 
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