Six months ago I had 4 crowns and 4 veneers put on, since then I have had a burning tongue and roof of my mouth. My tongue is also swollen... I am so scared, it took me years to save the money for this and now i am in pain every day of my life... Benadryl helps. My dentist pretty much has said sorry about your luck! I am assuming i am allergic to the material of the crowns and veneers . Any help will be most appreciated!