Tartar can have an impact on a person’s health. First of all, it causes poor hygiene in the periodontium, forming a long-term attachment of bacteria, which can directly lead to gingivitis and periodontitis. It causes chronic inflammatory irritation to the gums, and long-term periodontitis can eventually lead to loosening and even loss of all teeth. Gingivitis and periodontitis are in turn related to many systemic diseases. We have now established that the relationship between periodontitis and diabetes is bi-directional, with patients with more severe periodontitis having more difficulty controlling their diabetes, and the rate of periodontitis is much higher in diabetics than in normal people. Another aspect is that periodontitis is also thought to be closely related to Alzheimer’s disease. Alzheimer’s disease is also commonly referred to as dementia, and the bacteria that causes periodontitis, Porphyromonas gingivalis, is itself a major bacterium that causes Alzheimer’s disease. Therefore, from these perspectives, dental calculus is not only closely related to periodontal disease, but also to many diseases of the body, and patients are advised to remove dental calculus from the mouth as soon as possible.