Can Restylane Injections Add Volume to my Breasts?

Before explaining why we don't expect to see Restylane approved for use in breasts in the U.S., I should acknowledge that there is a similar product called Macrolane being tested in Europe for that.
There are downsides to it though, the main ones being that it is temporary and expensive. Who wants breasts that are gradually changing in size and have to be re-injected on a regular basis? And if you think of a sincle cc of Restylane costing a few hundred dollars, how much would a few hundred cc's for a typical breast enlargement cost?
Fat injections have much more promise but techniques for getting consistent results are still being developed.

The answer to your question is that Botox only works well for certain areas of the face. For example, the wrinkles commonly referred to as "laugh lines", which extend downward from the side of the nose to the side of the mouth are not addressed with Botox. Because of the size of the crease in this area and the manner in which it forms, it is treated using dermal fillers such as Restylane, Juvederm or Perlane.
The areas of the face where we commonly use Botox are as follows. In all cases, Botox works to address the issue of wrinkles in the particular area because it is able to relax the muscles that cause the wrinkles.

The "11" lines, the vertical lines between the eyes.
The horizontal forehead lines.
The crow's feet on the outer sides of the eyes.
The upper lip "smoker's lines".

Restylane is not FDA approved for injection into the breasts. You would also have to use a lot of Restylane to get a small result. Some folks were doing this in Europe and getting very modest results. Also Restylane will usually go away in 6 months. Restylane is a very good product, just not in the breasts.