Sodium Hydroxide is a popular substance as it is commonly seen in cleaning product as they can remove tough stains like burnt oil from metals or ceramic without damaging it. Since it is a strong alkali, it is also used for neutralizing. For example, our teeth, we eat food a lot of times and acids are formed on our teeth. Without any alkaline on our teeth, the acid will decay our teeth. Hence, the reason we have sodium hydroxide in toothpaste
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