Attempt #1: Baking Soda
Brushing my teeth with baking soda made them a tiny bit whiter, but wore off within a few hours.
Attempt #2: Crest WhiteStrips
Whitening strips made my teeth somewhat noticeably whiter, but wore off within a few days.
Attempt #3: Whitening Gel
My dentist made trays from molds of my teeth and I wore the trays with whitening gel every night for one week. The gel burned my gums a bit but now my teeth are now incredibly white!