Botox can be diluted to different concentrations depending on the physicians preference and the effect that is desired. Overall the most important issue is the total number of units given and the placement of the injections. If you were being treated between the brows for frown lines it may be perfectly normal to receive 4 injections for that area. It would be a little more unusual to only have 4 injections to treat crowsfeet. However, the bottom line is the end result. Botox can take up to two weeks to fully work. After two weeks, if you are happy with the result, than things are great. If you are not satisfied with the result, a different injection pattern or dose may help. Hope this is helpful. Marc Cohen, MDBala Cynwyd, PA & Voorhees, NJ