I took every year dental cleaning for my teeth but why I noticed some of my gums lines on front teeth are a little bit swelling that it recedes?

Receding gums. Receding gums can occur from gum disease, trauma, infection, decay, teeth grinding. Why they are swollen and receding can only be answered by a dentist doing a thorough clinical exam. Ask your dentist, or make an appointment with a Periodontist for an examination.