Dermal fillers or facial fillers are considered a very safe including popular brand names such as Juvederm, Restylane, Radiesse, Artefill, etc. that have undergone extensive testing and have received an FDA approval. Having stated that, it is a medical procedure which does come with some risks and side effects but side effects are generally minor and temporary and resolve within days.
It is important to have this procedure done by a Certified / properly trained injector but even in the best of hands, minor bruising and swelling may occur (most common side effects) but these resolve within days. For the most part, patients are able to return to work immediately after their procedure.