If it has been a while since your last dental cleaning and you don't notice any tooth sensitivity or pain, you may be wondering if it's really necessary to go in for regular cleanings. Here are some FAQs about dental cleaning and why it's so important. What Do They Check at Dental Cleanings? Dental cleanings are important because they are preventative treatment. The goal of the cleanings is to catch problems before they turn into problems that might require restorations, like crowns, or prostheses, like dentures.