Botox blocks signals from the nerves to the muscles. The injected muscle can no longer contract, which causes the wrinkles to relax and soften. It is most often used on forehead lines, crow’s feet (lines around the eye) and frown lines. Wrinkles caused by sun damage and gravity will not respond to Botox. https://www.medicinenet.com/botox_treatment/article.htm#how_is_a_botox_procedure_performed
According to a 2016 clinical studyhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5121792/, you can typically expect to see and feel the full effects of Botox 10 to 14 days after the procedure. According to Patrick J. O’Neill Plastic Surgery, In general, you should begin to see results between 24 and 72 hours, but some patients may not see full results for five days or more so you should wait the full 14 days to see the maximum results.