Usually 24-72 hours after injection, the Botox effects will start to show. The speed it appears depends on personal body type and absorption level. If results are not seen after three days, then you must return to the clinic and ask the doctor that performed the injection to give a new evaluation. As for stiff facial expressions in the injected area, it is related to the injection amount. If this unfortunately occurs, it is only temporary. The level of stiffness will slowly disappear after the drug effects decrease; you do not need to worry too much.