People often say that water should be boiled only once, and boiling it 2–3 times leads to the release of toxic substances such as dioxin, which causes cancer.
This idea worries many people, especially those who pay attention to their health and take such warnings seriously. However, specialists explain that under ordinary household conditions, reboiling water by itself does not produce dioxin. Dioxins usually appear in situations related to high-temperature industrial processes, waste burning, or chemical production. Boiling water in a kettle is not considered such a process. During boiling, part of the water simply evaporates. But if you boil water many times and greatly reduce its volume, it may increase the concentration of mineral salts and some impurities.
Therefore, it is more important not to boil water for hours repeatedly, but to use clean drinking water, clean the kettle from time to time, and monitor water quality.
