No, sunlight does not lighten teeth.
The Truth About Sunlight and Teeth Whitening
While sunlight can lighten hair and tan skin, it has no effect on the color of your teeth. This is true regardless of whether you've had professional teeth whitening or have tried DIY methods. The sun's ultraviolet (UV) rays simply don't have the bleaching power to alter tooth enamel's color.
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Myth Busted: Many believe the sun's bleaching effect on other things extends to teeth. This is incorrect.
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Effective Whitening Methods: For brighter teeth, consider professional whitening treatments from a dentist or approved over-the-counter products.
