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Gaten Matarazzo, from Stranger Things, with founder Kelly Wosnik are forming CCD Smiles, to help kids with cleidocranial dysplasia.

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Gaten talking about the past year and how season 2 is going

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The kids of "Stranger Things" are still very cute -- but according to star Gaten Matarazzo, they'll have a bit more wisdom in Season 2. In fact, he told AOL Entertainment, they've really grown up.

"They're all still trying to cope with everything that's been going on since the first season. It's obviously a very traumatic experience" coming face-to-face with the Upside Down, he said. "They've grown up a lot, not just in the sense that it's been a year, but in the sense that they almost got eaten by a monster from another dimension, so..."

The 14-year-old actor said that he and his fellow teen costars are "like siblings": "We're all very, very close ... I don't know what I'd do without them," Matarazzo said, adding that the cast keeps in touch outside of filming via group chat.

Outside of filming the hit Netflix series, Matarazzo has a hectic few months ahead: He teamed up with Holiday Inn as an ambassador for its "Summer of Smiles" program, during which hotels will host family-friendly events including breakfasts with beloved characters like Clifford the Big Red Dog. Meanwhile, Matarazzo's own widely-adored character, Dustin Henderson, has garnered him countless fans of all ages.

"I'm thankful for everything that's been going on in my life," Matarazzo said of his sudden stardom. Although he looks forward to hanging out with hometown friends in New Jersey this summer -- and is sometimes jealous that they have more free time -- he said, "I really can't complain because i've been having a great time doing what i'm doing."

"Stranger Things" is one of Netflix's biggest hits to date, released in July 2016, and its cliffhanger ending left fans frantically asking whether the show would return for a second season. Netflix officially renewed the show for a second season barely a month after its release -- a pretty impressive testament to its massive success.

Since then, the show's primarily teenage cast have become bonafide celebrities, regularly frequenting high-profile Hollywood events. They even took to the Emmys pre-show stage for a rendition of "Uptown Funk" in front of countless celebrity guests.

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Gaten Matarazzo reveals why the 'Stranger Things' kids will be majorly different in season 2

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The kids of "Stranger Things" are still very cute -- but according to star Gaten Matarazzo, they'll have a bit more wisdom in Season 2. In fact, he told AOL Entertainment, they've really grown up. "They're all still trying to cope with everything that's been going on since the first season.

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(Gaten's in it)

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Featuring Jaden Smith, Maddie Ziegler, Kylie Jenner and more

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If you didn't know, Gaten has ccd. This article shows Gaten talking about it and what ccd means.

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"Stranger Things" star Gaten Matarazzo has no problem discussing his genetic disorder.

The 14-year-old recently appeared on " The Jonathan Ross Show" with his Netflix costars Millie Bobby Brown and Caleb McLaughlin. During the talk show, Matarazzo opened up about his rare disorder, known as cleidocranial dysplasia, to try to raise awareness about the condition.

"It's a condition where you're born without your collar bones - I don't have any," Matarazzo explained. "It affects your facial growth, your skull growth... it affects your teeth... that's why I don't have any, these are fake, right here."

pic.twitter.com/Qmkpu3i7gQ - Casey Daniels (@caseydanix)September 27, 2016

As Matarazzo explained, cleidocranial dysplasia (CCD) is a rare disorder that affects the growth of bones and teeth. The severity of the disorder varies from person to person. Those who have underdeveloped or no collarbones may have "narrow and sloping" shoulders or be three to six inches shorter than the average person, according to Genetics Home Reference.

As for teeth, those with the disorder may experience a delayed loss of baby teeth or have misaligned teeth or jaw. While some people with CCD may require surgery, Matarazzo says he only has a mild case.

"A lot of people have it much worse than I do," he told host Jonathan Ross. "And I feel like putting it into the show is really raising awareness for it."

"I just wanted to raise awareness for it and let people know it's not something they should be afraid of showing."

Here, the teen is referring to his "Stranger Things" character Dustin, who has missing teeth due to CCD, hence his nickname Toothless. The creators decided to write Matarazzo's disorder into the show after he was diagnosed.

Since then, the teen has made it his business to spread awareness about the rare condition.

"When they wrote it into the show, I [started] getting a lot of messages and emails from people who have the condition, saying that it really helps them come out of their shells a little bit," Matarazzo told The Daily Beast. "They say that because this was in the show and this is the first time they've heard of it outside of the doctor's office, it made them feel really good and it inspired them."

Besides speaking out about CCD, Matarazzo has also shared photos of his fake teeth on Instagram. Back in July, the young actor posted an adorable selfie, writing: "Just letting you guys know. These are fake teeth."
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Gaten Matarazzo Of 'Stranger Things' Talks About His Genetic Disorder

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"Stranger Things" star Gaten Matarazzo has no problem discussing his genetic disorder. The 14-year-old recently appeared on " The Jonathan Ross Show" with his Netflix costars Millie Bobby Brown and Caleb McLaughlin. During the talk show, Matarazzo opened up about his rare disorder, known as cleidocranial dysplasia, to try to raise awareness about the condition.

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This video shows Gaten singing with his sister in 2016.

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NYY@NYM: Gaten and Sabrina Matarazzo sing anthem

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9/18/15: Brother and sister singing duo Gaten and Sabrina Matarazzo sing the national anthem before the Mets game Check out http://m.mlb.com/video for our full archive of videos, and subscribe on YouTube for the best, exclusive MLB content: http://youtube.com/MLB About MLB.com: Commissioner Allan H.

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This is an older video of Gaten isinging with his older sister, Sabrina. This video shocks me every time I watch it, because it's amazing that Gaten could sing really well at such a young age

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Sabrina and Gaten Matarazzo performing at the US Open 2010

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This is a short clip of an interview with Gaten during his Les Miserables days

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A Day With 11-Year-Old Les Misérables Star Gaten Matarazzo

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Get tickets to "Les Misérables": http://www.theatermania.com/broadway/les-miserables_200483/tickets/ TheaterMania goes backstage with the middle-school-aged Broadway veteran. Gaten Matarazzo may not get to spend as much time at the beach as he would like, but he's perfectly content with the gig he's got going on 45th Street.

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Here's a picture of Gaten taken in December of 2016 so you'll know how he looks like: