There have been many successful examples of injecting Botox into facial muscles and using its mild paralysis to reduce facial lines and make the skin look younger  but it also brings another unforeseen consequence: facial muscle paralysis caused by this toxin hinders proprioceptive feedback, which helps us understand other people's emotions
when the expression is subtle, the negative effect is very obvious, and for very strong stimuli, although there must be a tendency to perform worse, the difference is not significant, while for 'fuzzy' stimuli that are more difficult to identify, the effects of paralysis are very serious
People who inject botox and other micro-plastic surgery should try to avoid making subtle expressions