To brighten a dull smile

It can be hard to flash a genuine smile when teeth have lost their sparkle. The speedy fix: Brush with blue toothpaste (like Luster Now! Instant Whitening Fluoride Toothpaste, $6 for 4 oz., Walmart.com). “Color-correcting blue pigments cancel out teeth’s yellow tones for an instantly whiter-looking smile,” says dentist Lana Rozenberg, D.D.S., who works with celebrities in her New York City practice. The results last up to 5 hours—plus, with daily use, the paste’s peroxide lifts surface stains for a truly whiter, brighter smile.