Hello, You seem to be having trouble with the function of your jaw and cannot open well? My concern is that you have an infection. You should be seen by a dentist to determine if the position of the wisdom tooth is causing any interference. If you can keep the tooth clean and it will be in function, you can keep the tooth. If the tissue around the tooth is infected, the tissue can be cleaned out and sometimes needs to be removed. If the infection resolves, yes you can keep the tooth. The tooth may cause discomfort while errupting. Do you know if the opposing wisdom tooth is present and erupted to allow the teeth to be in function? If the tooth has decay or an abscess has developed, you would need to treat the tooth further with a filling or root canal. It may be best to remove the tooth. If the tooth is tipped or can t errupt fully, it may flare up with an infection over and over. This indicates that it is best to remove the tooth. You do not want an untreated infection to spread or get worse causing more pain. Other options rather than extraction may be available. Plan a visit to the dentist to discuss your situation and make an informed decision. Rinse the area and take some anti-inflammatory medication to feel better before your visit.