Yellow teeth will cause a lot of bad influence in life and in social activities. Turning yellow teeth has a lot of reasons, the following will introduce the four big bad habit that will turning to yellow teeth. A mouth of white teeth is everybody's dream. Instead, if your teeth yellow, the impression that you give to people will greatly discount. Investigation shows, there are four bad habits will make people's teeth become yellow slowly. Let's see what's the reason.
Drinking black tea or dark tea. There are a lot of tea polyphenols oxide, long-term drinking tea, can let the teeth become yellow. Research found that black tea in the tea polyphenols oxide supreme, and dark tea next, puer tea in the tea polyphenols, barley oxide content minimum, you can safely drink. In addition, cook tea time grow more, the role of the oxide is less. In order to ensure a mouth of white teeth, you may be extended cook tea time appropriately.