Answer:
Toothpastes generally contain the following components: Water (20–40%) Abrasives (50%) including aluminum hydroxide, calcium hydrogen phosphates, calcium carbonate, silica and hydroxyapatite. Fluoride (usually 1450 ppm) mainly in the form of sodium fluoride.
Answer:
The Roman Empire in the east transformed into the Byzantine Empire over time, so it's pretty hard to neatly separate the histories of the two empires, but most scholars agree that Emperor Constantine's reign was the start of the Byzantine Empire.
Explanation:
Answer:
The 4th sentence is punctuated correctly.
According to my dentist, I need to brush my teeth for at least two minutes.
Of or related to hydrometry