患者,女,21岁。刷牙时牙龈出血1年余。检查:牙石(+),牙龈边缘红,水肿,探针深度小于3mm,X线片未见牙槽骨吸收,最可能的诊断是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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