Canker sores, also known as mouth ulcers, or aphthous stomatitis, can form on the gums, inner cheeks and lips (anywhere inside of the mouth). Canker sores, while annoying, are common, and usually heal in a week or two.
The length of time that doctor's offices need to keep records varies by state. 5 years is a common requirement. Explanations of benefits (EOB's) are sent by the insurance companies to the patient, not to the doctor's office. 4/11/13- Actually, insurance companies send EOB's to both entities, patient and doctors.
Live EBV is in the saliva for 6 months or more immediately after mono. But EBV remains in the body for the rest of the life. It reappears in the saliva periodically throughout life. On any given day, about 1 in 4 people who once had mono will have EBV in their saliva.