Teeth that feel tight and swollen may be caused by periapical inflammation and excessive chewing. 1. Periapical inflammation: Usually patients experience symptoms of congestion and edema during periapical inflammation. With the development of inflammatory lesions in the periapical tissues, clinically the affected tooth may experience discomfort such as numbness, floating and swelling, which may cause the tooth to feel tight and swollen. 2. Excessive chewing: If the patient’s teeth often bite hard objects, or have the bad habit of grinding and clenching teeth at night, this may also lead to the phenomenon of teeth feeling tight and swollen. There are many other reasons for teeth to feel tight and swollen, patients are advised to go to the hospital in time and under the guidance of a professional doctor to carry out the relevant examination and treatment.