If somebody has discolored teeth from chewing betel nuts?

Ortho phosphoric aci: Superphosphozyme by biotics will whiten teeth. Use a qtip with few drops use on teeth and rinse off using water with little baking soda to remove any acid (or just rinse thoroughly).

Two things: Whitening toothpaste everyday and regular cleanings at your dental office at least twice per year (in addition to decreasing coffee consumption and tobacco use).

Stop eathing them.: Eating betel nuts can turn lips,mouth & feces red. My guess is you eat them alot if you now have red teeth. They can be quite toxic.

Stop: Regular chewing of the betel nut has been linked to cancer of the mouth and esophagus, oral submucous fibrosis, and tooth decay. The WHO has classified betel nut as a carcinogen and initiated an action plan to reduce its use. Stop chewing the nut and get your teeth cleaned professionally. Start there!