患者，男，70岁。右侧牙龈红肿3个月余,近日自觉牙齿松动伴疼痛。检査：右侧下颌第二磨牙颊侧牙龈红肿，溃疡lcm大小，边缘不整如菜花状，质硬，牙齿n度松动，右侧颌下淋巴结肿大。首选的处理措施是（ ）。

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