If there is no pain and swelling and just the bad taste then there is no need to worry. Your dentist is right ,this is the normal healing process. iI no bone cutting was done and the wisdom tooth extraction was normal then it will take another 2 to 3 days to go but if the extraction is surgical then the bad taste can be there for bit longer and healing process will be slow, Keep doing the warm saline rinses . iI will help in healing . If you want to know more about the wisdom teeth you can visit the followig link on our website......http://www.identalhub.com/articlecategory-wisdom-teeth-47.aspx