subgingival calculus is a hardened mineral deposit (tartar) that forms on tooth surfaces below the gumline. It develops when dental plaque absorbs minerals and becomes calcified over time. Because it sits under the gums, it is usually not visible without dental instruments. It is most commonly discussed in periodontal (gum) evaluation and professional cleanings.

tartar is the common name for dental calculus, a hard deposit that forms on teeth when plaque mineralizes. It is made from bacteria, proteins, and minerals from saliva and gum fluid that harden over time. tartar most often builds up near the gumline and between teeth, and it can also form below the gums. It is commonly discussed in dental cleanings, periodontal (gum) care, and cavity-risk assessments.

calculus is hardened dental plaque (a mineralized biofilm) that forms on teeth and along the gumline. It is commonly called “tartar” in everyday language. calculus is most often discussed in preventive dentistry and periodontal (gum) care. Clinicians identify and remove calculus because it can make plaque control harder and can contribute to gum inflammation.

biofilm is a structured layer of microorganisms that sticks to a surface and protects itself with a slimy matrix. In the mouth, biofilm commonly forms on teeth, gums, restorations, and dental implants. Dental “plaque” is a familiar example of biofilm. The term is used in everyday dentistry, hygiene care, and clinical research on cavities and gum disease.

dental plaque is a sticky, living film (biofilm) made of bacteria and their protective matrix. It forms on teeth, gums, dental restorations, and orthodontic appliances. In clinics, it is discussed because it contributes to cavities and gum inflammation when it accumulates. It is also “used” as a clinical indicator to assess oral hygiene and disease risk.

peri-implantitis is an inflammatory disease that affects the tissues around a dental implant. It is typically associated with bleeding and/or pus on gentle probing and loss of supporting bone around the implant. The term is commonly used in implant dentistry and periodontology to describe a specific cause of implant complications. In plain terms, it means “gum and bone inflammation around an implant that can lead to bone loss.”

peri-implant mucositis is inflammation of the soft gum tissue (mucosa) around a dental implant. It is commonly identified by redness, swelling, and bleeding when the area is gently probed. It is considered the implant equivalent of gingivitis around natural teeth. Dentists and hygienists use the term to describe an early, often reversible stage of peri-implant disease.

necrotizing periodontitis is a severe, fast-moving form of gum (periodontal) disease that involves death of gum tissue (necrosis). It is marked by painful, ulcerated gums and destruction of the tissues that support the teeth. The term is most commonly used in dental and medical settings to describe a specific clinical pattern that needs prompt professional evaluation. It sits within a group called necrotizing periodontal diseases, which are defined by characteristic tissue breakdown and symptoms.

necrotizing gingivitis is an acute, painful form of gum (gingival) inflammation with areas of tissue breakdown (necrosis). It is most often discussed in dentistry and periodontology when evaluating sudden gum pain, bleeding, and “punched-out” interdental papillae (the gum tips between teeth). It is part of a group called *necrotizing periodontal diseases*, which vary in severity and tissue involvement. The term is commonly used in clinical charts, dental education, and differential diagnosis of acute oral infections.

aggressive periodontitis is a form of periodontal disease associated with rapid loss of tooth-supporting attachment and bone. It has been used as a clinical diagnosis when gum disease progresses faster than expected for a person’s age and plaque levels. The term is commonly used in dental records, referrals to periodontists, and educational settings to describe a high-progression pattern. In newer classification systems, similar cases may be described using periodontitis “staging and grading” rather than this exact label.