It could be your big day to tie the knot. Maybe you're tying your kid's shoelaces. Or perhaps you're waiting for the other shoe to drop on your company's international dealings. Wherever you are in life and whatever is ahead of you, healthy white teeth is still a box you'd like to check. Genetics, lifestyle, food and drink choices, and oral hygiene routine are all significant factors in determining if your smile is bright — or not. But if it's not, there are various over-the-counter teeth whitening options that can fit into your way of life, whatever that may be.