I love to drink coffee shop teh c and yes yellowish teeth will start to appear. I tried Colgate Optic White toothpaste trying to make it less yellowish. So it is useful? Sadly no. I have used it for like past two years but no visible results. I have given up and move on. The retail price in Watsons etc is insanely expensive. It costs $8.90 for a small tube. So it is definitely not worth it. But if you really want to use that, you can try CK outlets or Swanston @ Chinatown. Usually can get like $2 to $3 per tube.
Is It Good?? 