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Is it grammatically correct and natural one? What do natives say when they find any word is hard to spell? Suppose, someone is reading an article and while reading it they found out that the words used in the article are quite tough to pronunce. Is there any expression to say this?
▪ Half of my teeth broke off reading this one.
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Hasibrahmanthe words used in the article are quite tough to pronunce

tongue twister

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Hasibrahman▪ Half of my teeth broke off reading this one.

I guess that is how they say it in your native language. I like it. We say that the word is a real jawbreaker.

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anonymousWe say that the word is a real jawbreaker.

Where in the world is that said?

 AlpheccaStars's reply was promoted to an answer.
AlpheccaStarstongue twister

This is also used in British English.

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anonymousWhere in the world is that said?

https://www.merriam-webster.com/dictionary/jawbreaker

https://www.ahdictionary.com/word/search.html?q=jawbreaker

I'll admit it doesn't come up much. Tolkein had Sam say that dwarf language was a fair "jaw-cracker", with similar import.