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This information page is intended to give honest and clear advice to readers and does not promote a prescription product. Sad looking mouths on our ‘resting-faces’ occur when the corners turn downwards. DAO treatment with anti-wrinkle injections can help to improve the appearance of downturned corners and possibly delay the onset of deep marionette lines. Marionette lines are grooves that run from the corner of your mouth down to your jawline. Most of us begin to notice their