Can Botox be used to prevent marionette lines?

Botox really is not best for treatment or prevention of marionette lines. These lines are generally unrelated to movement. The more common cause is that the tissue on the side of a relatively more fixed facial “ligament”  becomes lax and starts to buckle against that fixed area. Not everyone has the same anatomy here in terms of what happens as they age which is why marionette lines are so recognized as a hereditary feature. 
 Fillers such as those made of hyaluronic acid can be helpful in this area to some degree, particularly in mild to moderate cases. In more severe cases, a facelift as needed to improve the appearance of this area. 

Hi and thank you for your question.  Botox can be used to treat the DAO muscle, which is the muscle that pulls down the corners of your mouth. So this can help prevent marionette lines.
Dermal fillers can also be injected into marionette lines to help soften their appearance.

Wishing you all the best,

Stay absolutely safe and well,
Dr. Murray from Absolute Cosmetic Medicine

Thank you for your question!  Yes, Botox is a wonderful treatment to help prevent the progression of fines lines and wrinkles within the face.  Botox and other neuromodulators are purified proteins that relax the muscles of the face when they are injected.  As these muscles relax, the overlying skin will also relax and wrinkles will smooth.The marionette lines (lines around and under the corners of the mouth) can be treated with Botox by injecting the depressor anguli oris muscle.  This will help to turn the corners of the mouth upward.  In addition, the marionette lines also respond very well to hyaluronic acid filler injection.  Both treatments are very effective at helping improving this area of the face. I would consult with a board certified injector for a full evaluation to see what is the best treatment. I hope that this helps!-David Gilpin