I got my crown for my front teeth, last month its a zircon crown but to my surprise the shade behaviour is embarassing, in brighter light the shade seems to be matching with the adjacent teeth but when i see in mirror opposite to light it shows dull dirt shade .What would be the reason? Can i remove the crown n go for a new one if so which crown is better that will have same shade under all lightings , Please advice im really stressed due to this..