Injections can be used to relax muscles. Principally, this application is to prevent frowning i.e. to stop the “corrugator” muscles from drawing the eyebrows together. This can be used to reduce other overactive facial expressions such as excessive brow-raising or scrunching up of the crows’ feet. As the muscles are selectively targeted, there is no danger of being expressionless. Originally, this type of therapy was used to treat facial spasms. Its cosmetic applications are more recent. Continue reading →