In clinical practice, we often see patients coming to the dentistry department. The most common clinical misunderstanding of this condition is the submandibular gland ductal orifice. The submandibular ductal orifice is a slightly elevated bud on both sides of the sublingual area, and because it appears to be higher than the mucosal surface of the floor of the mouth, many patients think of it as an abnormal structure. However, it is actually a normal tissue in our body and can be seen by pressing on the floor of the mouth to reveal a clear, bright fluid spilling out of the duct opening. If the patient is not able to confirm whether it is a submandibular gland orifice, he can check whether the structure of the lower part of the tongue is symmetrical on the left and right sides. However, if there is an obvious abnormality in the sublingual side, it is indeed possible that there is a benign or malignant mass. Benign ones include sublingual gland cyst and pleomorphic adenoma of the sublingual gland, etc., while malignant ones include adenocarcinoma of the sublingual gland or carcinoma of the floor of the mouth, which are all possible diseases, and it is recommended to go to a specialized dentistry department for differential diagnosis of the disease.