There are two main reasons for routine cleanings. First, they help prevent periodontal disease. Second, and possibly more importantly, a cleaning allows for a COMPLETE oral examination. Only with general anesthesia can most oral health problems be noted. This includes screening for oral cancer, broken teeth, cavities, and in cats, tooth resorption. Finally, general anesthesia is required for periodontal probing, which is the method of diagnosis of periodontal pockets.