【单选题】【消耗次数：1】
社区牙周指数描述错误的是（）
①
0=牙龈健康
②
1=牙龈炎，探诊后出血
③
2=早期牙周病，龈缘覆盖部分探针黑色部分，龈袋深度在4～5mm
④
4=晚期牙周病，探针黑色部分被龈缘完全覆盖，牙周袋深度在6mm或以上
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