Yellow teeth and bad breath? Let’s fix that, pronto! Start brushing twice a day with a toothpaste that includes fluoride to fight cavities and baking soda for whitening (like Arm & Hammer). Use a tongue scraper to eliminate odor-causing bacteria, and rinse with alcohol-free mouthwash to keep your mouth hydrated. For sensitivity, try toothpaste with potassium nitrate (Sensodyne is great). If you’re feeling DIY, swish with a mix of water and hydrogen peroxide once a week for whitening—just don’t swallow it!