Only hyaluronic acid face fillers can be dissolved. Other semi permanent face fillers such as Radiesse & Ellanse can last longer, but cannot be dissolved. It is best to have a consultation with the doctor before proceeding with the treatment.
Common brands of hyaluronic acid fillers that can be dissolved are:
Juvederm
Restylane
Stylage
Belotero
Teosyal
Hyaluronic acid fillers can be dissolved using Hyalase (Hyaluronidase).