If you're that self-conscious drink coffee from a straw
Just avoid sticky candy and I know that wholegrains, lettuce, cucumbers, strawberries, apples, pears produce more saliva and slightly whiten your teeth. Meats are okay too just avoid the refined sugars. Use baking soda twice a month too and just make sure to get the form down. Drink plenty of milk too.
My teeth are not what they were the first week after the bleaching, but I will say that they are still pretty white. I'll see if I can get some before after pics but yeah, I'm still happy about it. I try to brush my teeth twice a day (use electric brush) , sometimes I miss a whole day's worth but they are still better then average.
I also got some gel that I could put on my teeth to re whiten them, I used it once and it pretty much brings it back to what it was when it was bleached. I'll look at the box and post it online if anyone wants to try to buy it. You put it on your teeth and wait 30 minute and they are WHITE, SPARKLING white.