Do not smile for no reason, but practice smiling with purpose. Smiling excessively is interpreted as a sign of submissiveness. Unless being submissive is your goal, it is better to reduce the number of smiles (if over smiling is an issue for you) and instead smile only when it is warranted. Smiling purposefully will make you appear more socially confident and focused, which will improve your social success and help you reach your goals. You can consider improving the appearance of your smile if needed by keeping your lips moisturized with a balm and using a whitening brand of toothpaste.
