"teething troubles : (idiomatic) Also teething trouble: small problems such as are to be expected..."

“teething troubles : (idiomatic) Also teething trouble: small problems such as are to be expected with any new and untried product, system, or venture.
Today is World Oral Health Day, an annual event organized by the FDI World Dental Federation to raise awareness about oral health.”

- https://en.wiktionary.org/wiki/teething_troubles#English

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