Just like your normal adult teeth they can’t come in until your baby teeth are gone and there’s room for them. Kids only have 20 teeth and adults have 32 (including wisdom). You usually lose molars later in childhood and your jaw still needs to grow for them to emerge.
They hurt because growing teeth kinda hurts and they can start growing before they have enough room which causes your other teeth to shift (hurts) and why they get removed a lot of times.
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