The amount of discomfort will depend on how easy it was to remove the tooth. There is usually some swelling and discomfort for a few days afterwards, and it is important to follow any advice you get about mouthwashes and so on, to help with the healing. Normal painkillers such as paracetamol or ibuprofen will usually deal with any pain. It is best to stay fairly quiet and relaxed and avoid smoking and drinking alcohol for 24 hours afterwards to make sure there are no bleeding problems. There may be some stitches to help the gum heal over. Your dentist will probably want to see you again about a week later to check how your mouth is healing, and to remove any stitches.