The inside of the lips and gums always stick together, may be the oral mucosa or periodontal local inflammation, resulting in reduced salivary secretion and inflammatory fluid oozing. 1. Periodontal inflammation: the inside of the lips and gums often stick together, may be the emergence of chronic periodontitis, there is abnormal fluid oozing overflow pus and sticky secretions, resulting in gums and lips adhesion. 2. Inflammation of the oral mucosa: oral mucosa herpes, ulcers and other diseases, ulcers or lesions, localized dryness, or Scheuglen’s syndrome or inflammation of the salivary glands, salivary secretion is reduced, will cause the gums and lips stick together. The inside of the lips and gums are always sticking together, most of them have oral diseases, it is recommended to go to the hospital in time to deal with it.