Write a concise article that reviews the Groupon Botox deal at Beauty Factory SD, balancing a consumer-centered verdict with an accessible explanation of how Botox works. Include a brief layperson-friendly science note on botulinum toxin, plus safety considerations and the importance of board-certified providers. Compare what the deal promises (units, areas, typical results) with realistic outcomes and potential risks. End with practical tips for evaluating promotions, questions to ask, and how to decide if it’s worth it for the reader. Keep the tone informative, transparent, and engaging.