Hvornår kan mundhygiejnen blive skadelig?

English summary What oral hygiene practices are potentially harmful? Nor Tannlegeforen Tid. 2025; 135: 126-31. This paper describes potential harms that might result from oral hygiene practices and discusses how to prevent the harms. These harms can be classified into four categories: abrasion, erosion, gingival recession and fluorosis. Toothpaste abrasivity plays a key role in causing abrasion. A common abrasion lesion is non-carious cervical lesions that have traditionally been considered equivalent to toothbrushing abrasion. However, acid from diet and stomach that demineralize teeth also increase abrasion because the acid-softened tooth is more prone to abrasion. In fact, erosion seldom occurs alone but as “erosive tooth wear”. Gingival recession is associated with a number of factors such as brushing technique, brushing force, and hardness and type of the toothbrush bristles. The pathogenesis of dental fluorosis is that the fluoride alters the rate at which amelogenin is enzymatically broken down and removed, and thereby alters the action of proteases resulting in a decreased availability of free calcium ions. Abrasion and erosion are relatively common conditions in the Nordic countries, while dental fluorosis in cosmetic stages is rare. There are preventive actions for oral hygiene harms e.g. low abrasive toothpastes to prevent abrasion, avoiding acidic foods to prevent erosion and reasonable systematic intake of fluoride to avoid fluorosis.