White teeth become less white over time as the mineral structure of your teeth changes and as your enamel becomes more porous.
Teeth can also become discolored from smoking, coffee, red wine and even fluoride from tap water.
Yellow teeth are a real embarrassment, a dent in the otherwise confident personality.
Smiling, which usually feels good, can also make you feel self-conscious if your teeth are less than white or your lips are lined or cracked.
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