Tooth eruption usually happens without people even knowing about it. An x-ray of a child’s skull shows that teeth don’t form and emerge from the gum line; they’re already formed from the get go, with primary teeth filling the gums until a person has grown big enough to accommodate their permanent teeth hidden underneath. Tooth eruptions happen as you keep losing milk teeth and fill the gaps with permanent teeth until you’ll get a full set of them altogether. Wisdom teeth, which are the last of the permanent teeth to erupt, emerge around the time you’re already a young adult, hence its name (although it doesn’t follow that with age comes wisdom).

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