Basically, don't make duck face in photos if you want them to be timeless. Everyone appreciates a great smile in life, and also in photos. I noticed I wasn't smiling with my teeth as much for a season and realized that I wasn't happy with my teeth. I drink a lot of tea and I noticed there was a small stain on the bottom row. A few weeks of whitening strips worked miracles and I couldn't stop smiling! A beautiful smile is another sure way to look great in every photo, even if you don't show your teeth.