Deep cavities or severe trauma to the teeth can damage the nerve in the teeth. If this happens you may experience intense pain and swelling, but sometimes there are no signs or evidence except what our X-rays show. The inside of the roots of teeth in these situations need to be cleaned of all toxic substances and they need to be sealed off. The procedure to accomplish this is called Root Canal Treatment. It can be rendered painlessly the same way as the ordinary repair of teeth. Check the ‘Repair of teeth’ section on how this is done.