Smaller sized doses for perioral treatment than for higher facial purposes are used because the oral musculature responds much more strongly to precisely the same BTX-A dosing. Just one planning of botulinum toxin type B (MyoBloc®/NeuroBloc®) exists. Its sole sign and FDA approval lies in treatments of cervical dystonia. https://jetonlinepharma.us/product-category/botulinum-toxins/