This study evaluated the superficial microhardness of enamel in teeth at different posteruptive ages (before eruption in the oral cavity. 2-3 years after eruption. 4-10 years after eruption and more than 10 years after eruption). The study sample was composed of 134 specimens of human enamel. https://www.roneverhart.com/Crescent-Moon-Phase-Blade-180-224-ED-East-Non-Ladder/