Drinking coconut water daily is healthy as it provides hydration and essential nutrients, but there is no direct evidence to suggest that it can specifically improve your jawline.
A more defined jawline is largely influenced by genetics, body fat percentage, muscle tone, and overall dietary habits. Maintaining a balanced diet, staying hydrated, engaging in facial exercises, and managing body fat through regular exercise can contribute to a more defined jawline over time.
If you're looking for ways to enhance your jawline, focusing on overall fitness and health will be more beneficial than relying on a specific beverage. Always consult with a healthcare or nutrition professional for personalized advice.