“Stranger Things would not be the same show if it wasn’t for Dustin Henderson.

It turns out, Matarazzo also has this condition off-screen.

“You’re always born with it,” heexplained.

Gaten Matarazzo smiling

“And it affects pretty much every bone in your body.”

What exactly is cleidocranial dysplasia?

“The oldest was 86, and he’d never met anybody with the condition.”

Gaten Matarazzo smiling on the red carpet

The condition affects how bones in the body form.

For Matarazzo, the condition has caused him to be born without collarbones.

It has also affected his teeth.

Gaten Matarazzo doing thumbs up from a hospital bed

Unfortunately, medical procedures will continue to be common in Matarazzo’s life.

“I will have more surgeries coming.

“Hopefully at least.”

Gaten Matarazzo smiling

The film and television industry didn’t seem to understand him at first.

“I remember casting directors would constantly tell me, like, ‘Oh, kid.

“I’d explain the condition,” Matarazzosaid.

Gaten Matarazzo in Stranger Things

However, he never thought “Stranger Things” would turn into the success story that it is today.

“It was going to be a mini series.

It turns out, Matarazzo had exactly that.

Gaten Matarazzo in Stranger Things

Something was different, though: He now had a full set of front teeth.

This changed in Season 3.

When it premiered, Henderson’s front teeth were, yet again, missing.

Gaten Matarazzo smiling

That’s when the young actor began opening up about how he had been wearingdenturesduring the previous season.

Many people diagnosed with CCD undergo various surgeries, and these bills add up over the course of time.

“I think that having an organization keeps me grounded,” the young actor toldWE.

“It gives me an objective, and it gives me a purpose to be in the limelight.”

“That you’re making an impact in the world.”