Tartar, also known as dental calculus, is hardened plaque that forms when minerals from saliva combine with plaque on the tooth surface. Tartar is porous and rough, providing an ideal environment for additional plaque buildup and bacterial colonization. It typically appears as yellow or brown deposits along the gumline and between teeth and cannot be removed by brushing alone. Tartar accumulation can irritate the gums, leading to inflammation and gum disease if left untreated. Professional dental cleanings are necessary to remove tartar and prevent its harmful effects on oral health. Maintaining good oral hygiene habits and regular dental check-ups can help prevent tartar buildup and protect the teeth and gums.