Platelets cause clotting, and without those, people experience nosebleeds, bleeding gums and extended bleeding from cuts. 血小板具有凝血功能，缺乏血小板会引起鼻出血，牙龈出血和伤口出血不止。
With aging, the detectable rate of gingival bleeding and calculus was increasing, the prevalence of JP was also increasing. 随著年龄的增长，牙龈出血及牙石的检出率逐渐上升，牙周炎的患病率也逐渐增高。
