Apr. 30, 2015 -- A shot that dissolves fat will offer people with a double chin a way to get rid of it without surgery.

The FDA approved the new drug, called Kybella, on Wednesday. It will be available in cosmetic surgeons’ and dermatologists’ offices in June.

Here’s what you need to know.

What is the treatment and how does it work?

Kybella is identical to something your body makes called deoxycholic acid, which helps to absorb fats, the FDA says.

It works by destroying fat cells. It can also destroy other kinds of cells, including skin cells, if it’s not used correctly, the FDA says.

The shot is an alternative to liposuction or surgery to treat double-chin fat.

Why is it needed?

"Upwards of 80% of people [with double chins] are concerned about the condition," says

Derek H. Jones, MD, an associate clinical professor of dermatology at UCLA’s David Geffen School of Medicine. Jones was the lead investigator in a study sponsored by the drug's maker, Kythera Biopharmaceuticals.

How many rounds of treatment do you need, and what results should you expect?

It varies. Alan Matarasso, MD, a plastic surgeon in Manhattan, thinks patients will need a series of 12-20 injections per visit. You may need two to three total visits, spaced a month apart. Each treatment takes about 15 minutes.

Some people may get up to 50 injections in a single treatment, with up to six single treatments no less than a month apart, the FDA says. Many people saw results in two to four treatments, according to Kythera.

Although it's not approved for saggy skin, can it help tighten it?

Experts don't agree. "It doesn't tighten your skin. It is there to melt fat," Matarasso says. But Jones says some people did notice a tightening effect.

Before approving the drug, the FDA looked at the results of two U.S. trials that included more than 1,000 people. Those who got the drug more often saw less fat under the chin. More than 80% of those getting the drug said they noticed some improvement in their chin fat, the company says.