A dental examination is necessary for appropriate diagnosis and management of your condition. It is possible that your dentist has prescribed antibiotics for preventing spread of infection. If there is dental decay you may need treatment for the cause. The treatment can be decided only after in you whether you will need root canal or extraction. Dental cavities if left untreated can lead to serious complications like dental abscess or spread of infection to surrounding structures. For more queries and concerns visit your dentist and get evaluated. Hope it helps.
Best wishes and regards!