1 swollen submandibular gland on right side don't feel ill or like i have an infection any idea what can cause this ?

Swollen gland: Patients cannot determine on their own whether or not they may have a dental infection which is asymptomatic. This requires not only a clinical exam by a professional but x-rays. There are also other causes, both dental and medical that can cause swollen glands (or other lumps that are not glands). See your own dentist first for an evaluation.