Tartar occurs when plaque is not removed properly/insufficiently within 24 to 48 hours. Due to the reaction of minerals from saliva, the plaque hardens and can no longer be removed with a toothbrush. Plaque easily adheres to the rough surface of the tartar. Tartar does not always have to be visible above the gum line, but can also attach itself below the gum. This increases the risk of inflammation of the gums (gingivitis/periodontitis). It is important that the dentist or dental hygienist regularly removes tartar.