gangrene of gingiva

例句：

1. 1.The patient's teeth were severely affected by the gum disease.
   病人的牙齿受到了严重的牙周病影响。
2. 2. The dentist advised him to seek medical attention immediately for the gum necrosis.
   牙医建议他立即寻求医疗帮助，因为牙龈坏死了。
3. 3. The condition was diagnosed as a form of gum necrosis, which requires immediate treatment.
   这种状况被诊断为一种形式的牙龈坏死，需要立即治疗。