Hyaluronic acid (HA) dermal fillers are the benchmark for temporary fillers. HA is naturally found in the body, so there is little chance of an adverse reaction, and it can be metabolised and disposed of naturally.
With a permanent filler, the only way to get rid of it is to cut it out. HA can be dissolved with an injection of an enzyme called hyaluronidase. It is, therefore, easier to correct any problems, and HA degrades naturally within the body.