中文摘要：

下颌下腺是人体的重要功能器官，随着唾液腺内镜的广泛应用以及对IgG4相关唾液腺炎等炎性疾病的新认识，大量原本需要摘除的下颌下腺可得以保留。然而，仍有一些本可以保留的下颌下腺被切除。本文倡导新知识、新技术的普及和推广，重视下颌下腺功能器官的保护。

英文摘要：

Submandibular gland is an important human function organ. With the wide application of sialoendoscope and new understanding of IgG4 related sialadenitis, a lot of submandibular glands which were previously considered to he removed are preserved. However, some submandibular glands which might be preserved are still unfortunately sacrificed. Therefore, we advocate the popularization and promotion of new knowledge and techniques and should pay more attention to the protection of the function organ of submandibular gland.