Many believe that reboiling water multiple times can make it toxic or harmful to health, prompting them to add fresh water each time. However, science has debunked this myth. Water experts, according to the website "science.mail", confirm that boiling does not change the water molecules themselves but only leads to the loss of dissolved gases like oxygen and nitrogen. This loss may slightly alter the taste; tea or coffee made with reboiled water may seem less flavorful, but it remains perfectly safe to drink. Additionally, the concentration of some minerals and salts may increase slightly due to the evaporation of part of the water, but this effect is very minimal, especially if the water comes from a clean and reliable source. It is incorrect to claim that boiling creates harmful new compounds unless the water was already contaminated, which is rare in good drinking water. So, when is it better to use fresh water? If the water is hard or rich in minerals. If the water has been left standing for a long time. In these cases, using fresh water may be better for taste and to prevent sediment buildup, but it is not linked to any real health risk. Therefore, water can be safely reboiled if it is clean and not stored for long; typically, only the taste is affected, while the quality of the water source and the cleanliness of the kettle are far more important than the number of times it is boiled.
