Are results with Juvederm immediate, or will facial lines continue to improve after treatment?

Thank you for the good question. After injection with Juvederm the skin
becomes more swollen for a few days. This then subsides, but the area injected
becomes smoother and looks better over a couple of weeks due to the absorption of
water. I hope you find this helpful.

Hi.  Yes, you do see immediate results with the filler injection.  Juvederm is a "hydrophilic" (water-loving) material, so it soaks up water over time.  This gives a secondary improvement.  However, once the material is gone, you return to your pre-injection state.

I do not feel that HA fillers build collagen so I think you go back to your normal look after the fillers dissolve.  Fillers like Radiesse, Sculptra, and Bellafill do give a long term result especially in combination with laser procedures.  Best, Dr. Emer.