Why Can't Teeth Heal Themselves?The biological reason your enamel never grows back

From the show

Oh, god... really?

Understanding why enamel damage is permanent reveals a frustrating limitation in human biology. Unlike bones that mend, the cells responsible for building your teeth die and disappear as soon as they emerge from the gum. This evolutionary quirk leaves you with a finite, non-renewable shield, explaining why dental work is mandatory while sharks simply grow new replacements.