Amorphous calcium phosphate (ACP) is a common term used in the field of dental science and biochemistry. As ACP is quite a long word, there are a few synonyms that can be used to describe this substance. Some of these synonyms include "calcium hydroxyapatite," "calcium phosphate," and "amorphous calcium phosphate nanoparticle." All of these terms are used to refer to the same substance that is often found in dental products, such as toothpaste and mouthwash. Regardless of the name used, the properties of ACP remains the same- it is a highly soluble substance that is commonly used to remineralize tooth enamel and prevent tooth decay.