Signs that you might need a dental deep cleaning include gum disease symptoms like bleeding gums, persistent bad breath, or loose teeth. Excessive plaque and tartar buildup are also indicators. These visible accumulations of bacteria and debris around the teeth and gums suggest that regular brushing might not be enough. Early identification of these symptoms is crucial to prevent advanced periodontal disease and potential tooth loss, as highlighted by the National Institute of Dental and Craniofacial Research.