Hello, Thank you for your inquiry. Since you have reported a recent trauma, I suspect you may have some nerve issues. Have you had an appointment with a neurologist? Inflammation can cause swelling and temporary pressure on nerves. Anti-inflammatory medication such as Tylenol or Motrin may help reduce inflammation. Plan to schedule a visit with a neurologist if problems persist or worsen. A fall with trauma to the mouth can cause cracked fillings. If you have any metal fillings such as amalgam, this could be the cause of a metallic taste. Fractured teeth may occur at the time of an accident or months later. I suggest you consider a full dental exam with a complete set of x-rays. This may detect tooth problems a nd be a basis for any future problems to help a future diagnosis. Infections of the mouth and taste buds not functioning properly are other causes for a change in taste. I suggest that you discuss your condition and accident details with your dentist. I hope my suggestions are useful to you and your condition will improve.