No, the skill of good cosmetic dentistry is making sure that the teeth are the same colour after treatment. They blend in with your teeth and special attention is paid to the shade, colour and shape so the crown or crowns agree or improve your own teeth. An issue my arise if you are whitening your teeth because a crown will not whiten like you teeth. To make sure you are happy with your treatment talk to the dentist about your expectations and desired results. They have performed thousands of treatments and will be able to advise you on the best result you can achieve.
