Every patient is built differently. There are so many variables, and each patient evolves over years to need additional areas treated and additional units used to effect the desired result. The doctor can dilute the Botox differently from another doctor with sterile saline, but the total units delivered per area is the key. My dilution may be more concentrated than another doctor, but as long as we inject the same number of units of Botox in the same area in the same patient, then the result should be the same. So it's not the volume of the liquid injected, but the units of Botox cosmetic used that's important and can be used to standardize the treatment for the particular patient.The glabella (between the eyebrows) can have 12 - 35 and even up to 50 units (the latter for some stubborn bulging male muscles I have seen in a few patients). So depending on the concentration used, a "dash" of 0.1 cc of Botox could be 10 units, 5 units or less. 0.01 cc is one unit if the Botox is diluted with a vial containing 100 units with 1 cc of sterile saline. If 2 ccs of saline are used to mix the Botox, then 0.02 ccs are needed to deliver one unit of Botox.