Facial muscle activity alone can't prevent sagging.

While constant smiling or raising your brows might temporarily counteract sagging, it can lead to the development of expression lines, like forehead wrinkles or crow’s feet.
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Overusing facial muscles doesn't stop gravity, which continuously pulls the skin downward, eventually causing sagging.

Additionally, excessive facial movements can make you appear older due to the formation of wrinkles.

Preventing sagging requires a balanced approach, including skincare, healthy habits, and possibly medical treatments, rather than relying solely on muscle activity.