It depends on what your initial situation is and what your aims are. Our dentists at Marylebone Smile Clinic prefer not to file down teeth and we almost always limit reshaping to less than 10% of the teeth. This improves the lifespan of the natural tooth and is safer for the teeth and associated nerve supply.
There are methods for ceramics that are extremely aggressive, typically filing teeth down to short stumps/fangs. This is commonly seen and advertised online and in social media in dental tourism, advertised as ‘Turkey Teeth’. This is not a representation of cosmetic dentistry in London’s Harley Street Medical District as our approach is to provide excellent outcomes at the minimum of loss of natural tooth structure.