Teeth come in many shades and they change color over the years from various factors, like drinking a lot of coffee. Although few people have bright, white teeth naturally, tooth discoloration can make your smile look aged and dull. If you have a big event coming up, you can revamp your pearly whites and boost your self-esteem with teeth whitening. As the big day approaches, here’s when you should start teeth whitening to ensure your smile is its brightest in time.