By Julie Mazziotta
January 29, 2020 at 05:02 PM EST
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Gaten Matarazzo is ready for surgery number four.

The Stranger Things star, 17, shared a photo on Wednesday from the hospital before heading into surgery for his cleidocranial dysplasia, a rare genetic disorder that affects the growth of his bones and teeth.

“Surgery number 4! This is a big one!” he wrote on Instagram.

Matarazzo did not share more about this surgery, but he previously told PEOPLE that he’s already had several surgeries on his mouth. He also said that he has a “very mild case” of cleidocranial dysplasia, or CCD, compared to others.

“There’s a one in a million chance that you have of getting it — most likely you get it from a parent, but it just happened for me,” he said in 2016. “I have a very mild case so it doesn’t affect me as much, but it can be a very difficult condition to have.”

He does, however, think that it affected his career.

“It’s one of the reasons why I haven’t been getting roles, because of my lisp, and the teeth situation, and my height,” he said in 2018, during an appearance on The Doctors. “That affected pretty much everything. I would go three times a week for auditions all the time and get constant ‘no.’ ”

That all changed in 2015, when he landed the role of Dustin on Stranger Things. Matarazzo says his disorder actually helped him get the part.

Emma McIntyre/Getty Images

“It really started out when I was stretching in the audition room,” he said. “They were like ‘Wait, wait, wait what did you just do?’ and I said, ‘What? I’m stretching’ and they said ‘No, do it again and they said ‘Why do you do that? Your shoulders are touching.’ … So I started explaining what it was and how I had a condition from birth that affects my teeth and everything. That’s why I was missing teeth in the first season, and I still have my appliance in right now.”

Matarazzo now works with CCD Smiles, a non-profit organization that raises money and awareness for people with the condition. He told PEOPLE in 2016 that his role on Stranger Things helped bring more attention to CCD.

“The feedback has been great,” he says. “A lot of people were messaging me saying, ‘You made me feel better about myself, that you can show that you have this condition on TV and embrace it.’ I feel like I’m raising awareness for it. It makes me feel good.”

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This article originally appeared on People.com

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