Neuromodulators, which work by blocking signals from the nerves to the muscles. Under your skin, your muscle can’t contract or can only contract so much, making the wrinkles relax and soften. In this way, neuromodulators can be used to treat existing wrinkles, but they can also be used preventatively. Preventative treatments target these muscle groups to prevent that wrinkle from appearing.
The degree of muscle movement you wish to maintain is up to you, and your practitioner can adjust your treatment accordingly.