Swelling of tongue after multiple teeth extraction can be there because of surgical trauma to the tongue during tooth extraction. Some swelling of tongue can also occur because of infection on tongue. If there is no objective swelling present and you feel heaviness or swelling of tongue, then it can be because of lingual nerve damage during teeth extraction. Nerve can get bruised or squashed during extraction and can cause temporary numbness and feeling of heaviness of tongue. If swelling is because of trauma to the tongue, then swelling will regress in some time. Keep tongue clean to avoid any infection of the tongue. Dizziness can occur because of medicines or can be result of multiple teeth extraction and less of food intake. Take nutritious soft foods. For faster healing of extraction socket, you can continue with warm saline rinses. You can get your missing teeth replaced with Dentures, implants or implant supported dentures.  For more info on complications after tooth extraction visit……   http://www.identalhub.com/dental-complications-after-tooth-extraction-881.aspx