I have been performing Botox "Nefertiti Necklifts" for well over thirty years. They can be quite helfpul when clenching results in pronounced vertical neck cords. So, in this case, Botox would likely be somewhat helpful. The appropriate choice of HA fillers, injected with the proper technique, i.e. a Nonsurgical HA Filler Necklift, would likely provide a more substantial improvement, as would, of course, combining these two approaches. A nonsurgical filler necklift is a very advanced injection technique and should not be left to the hands of novice injectors accustomed to the use of simple Juvederm or plain Restylane for treating smile lines. You would be wise to consult with an experienced, board certified cosmetic dermatologist injector and best of luck.