Having white teeth is a sign of good health and personal hygiene and is also essential for a lovely smile. A brighter smile can boost your confidence and self-esteem.

Yellow teeth are a real embarrassment, a dent in the otherwise confident personality. Smiling, which usually feels good, can also make you feel self-conscious if your teeth are less than white or your lips are lined or cracked.

Want brighter, whiter teeth? Install this app to find out which teeth-whitening strategies perk up your smile - and how to avoid stains.