Although there are recommended dilution parameters, there is no set standard. The main thing that matters is how many units you have received. If both doctors give you 20 units for example, then it does not matter how they diluted it.
The next important thing is outcome. If you are getting the outcome you are looking for, then the dilution is not important again. The last important thing is cost. If they price per unit, then again the dilution does not matter. If they price per area and you are getting good results at a competitive fee, then the dilution does not make a difference.
The best thing to do is look for a board certified physician who is experienced in botox injections and ask your friends, family and other physicians. Word of mouth about the outcomes an office has is the best way to find a reputable office to work with.
Be careful of places that advertise rock bottom prices that sound too good to be true - they usually are. Those are the places you have to worry about how diluted the botox is, and if you are getting the correct number of units to have an effective treatment.
