Which of the following properties is true for a tooth paste ?

Tooth decay occurs when the pH in the mouth falls below 5.5, causing the corrosion of tooth enamel, which is composed of calcium hydroxyapatite (a form of calcium phosphate) [1]. Bacteria in the mouth degrade sugars to produce acids, which leads to this demineralization [1]. Toothpastes are generally formulated to be basic (alkaline) to neutralize these excess acids and prevent decay [1]. While some modern toothpastes may have a neutral pH or contain calcium phosphate for remineralization, the fundamental property highlighted in standard scientific literature for cleaning and acid neutralization is their basic nature [2]. Studies show many common toothpastes range from pH 8 to 10, confirming their alkaline properties [1]. Therefore, the most accurate general property among the given options is that toothpaste is basic.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > pH change as the cause of tooth decay > p. 27
2. [2] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 5: Print Culture and the Modern World > A bright smile from toothpaste and minerals > p. 105