Back when I first started injecting Botox for cosmetic reasons in 1991, much still had to be learned about injection techniques and best dosing and concentrations. All too often, novice, inexperienced injectors at the time (and many even still today) used cookbook concentrations of Botox and cookbook techniques that all-too-frequently left people with the very unnatural inability to raise their eyebrows and forehead or the inability to frown and even with high arched eyebrows that were dubbed the "Spock" look after the famous Star Trek character Mr. Spock. Fortunately, it didn't take long before experienced injectors strove for natural looking results that allowed for smoother skin at rest, while retaining the natural ability to emote expressively. Bottom line: Make sure to consult with an experienced, board certified cosmetic dermatologist (Yes, cosmetic dermatologists are responsible for the development of well over 95% of all nonsurgical rejuvenation procedures popular today, such as fillers, energy-based devices, Botox, etc.). Hope this helps and best of luck.