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Eruption was the process by which teeth burst through gums.

An infant who was undergoing eruption was said to be teething. (ENT: "Similitude", TNG: "Dark Page") Tending to a teething child could lead to a loss of REM sleep on the part of the caregiver. (ENT: "Similitude") Pain caused by teething could be soothed with a teething ring. (TNG: "Dark Page")

In 2372, The Doctor warned Samantha Wildman that although she could breastfeed baby Naomi immediately, she'd have to stop doing so in there to four weeks, as Naomi's incisors would erupt by then, causing problems for Samantha, who lacked the scales of a Ktarian woman. (VOY: "Deadlock")

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