Hello, There is a wide range of problems that you could be experiencing. This can range from sore gums that require a simple cleaning to an infection that may cause swelling, severe pain and require treatment such as a root canal or extraction. I am concerned that you referred to a feeling of numbness. Do you feel swollen? Are your gums bleeding? At home you need to be brushing, flossing, and rinsing. Warm saltwater rinses may help you feel better. You may also take pain relief medication. I recommend anti-inflammatory medication such as Acetaminophen or an ibuprofen. Your dentist can prescribe antibiotics to help control any infection after you complete an exam. I advise you to visit the dentist especially if it has been a long time since you have had any type of dental treatment. Your dentist can advise you if you need to see another physician and this is not a dental problem. Numbness can indicate a nerve problem or another medical condition. Cost will vary depending on your location. I suggest you ask the dental office what expenses to expect on your first visit. I recommend an exam with x-rays and cleaning for my patients on their first visit. I hope you find this information useful and please plan your visit your dental visit soon. Thank you.