Your frown lines are caused by years and years of repeated contractions of the Corrugator muscles. This in turn causes a thinning of the overlying fat and skin - creating wrinkles. The ideal treatment will include both Juvederm AND Botox.
Juvederm is a fabulous Hyaluronic Acid filler - and will do well filling these fine wrinkles. The problem is, that without Botox, the muscles in this area will still contract - and the Juvederm will be forced out of the area, therefore reversing a good correction.
Adding Botox, which will smooth the collapsed wrinkles, then using Juvederm to fill in the lost fat causing the wrinkles, results in a smooth and plump area. The Juvederm will stay put, since the Botox has temporarily paralyzed the area muscles, and the treatment will last much longer than either Juvederm or Botox used alone.
Botox lasts about 3-6 months, Juvederm can lasts 6 months, combining the two products can actually make your treatment provides much longer results than either product would alone.
However, you need to see a board certified dermatologist or plastic surgeon in person, to have your unique situation evaluated and treated.