Is the effect of Botox in the platysma muscles cumulative?

Thank you for your question. I have seen weakening of the muscle with repeated injections to the platysma bands. This may allow you to decrease the frequency in which you need the injections. Please see a board certified plastic surgeon who commonly performs this procedure for an in-person examination. Hope this helps. 

Thank you for your question. Botox in the platysmal bands can soften the contraction of muscles. In addition, Botox will most likely be required for prolonged results. Best,  

Over time, repeated botox injections can lead to longer intervals between treatments as muscles become less engaged or "re-trained".  However, upon discontinuation of injections, the muscle activation would return. There is a preventative effect to botox injections that, by decreasing muscle movement, less elastin/ collagen degration occurs.  This effect is likely minimal in the neck since this is not a "movement" muscle.