of course a photo would be needed to tell how much material will be needed.. smile lines can be easily filled but since they move so much during facial expression i would not expect the results to last as long as an injection in a non moving area such as the cheek bone or in an acne scar
While it is hard to say how much you will need without seeing any photos the good news is that it does not matter. One of the beauties of Bellafill is that Bellafill is a long term filler. It is, in fact essententially permanent, so if one syringe does not get you the results that you are looking for, it will be an improvement and you can always add more at some point in the future. If you compare Bellafill to the other fillers, you will always have to come back for more with all of the others. I hope that helps.Best regards.