It is safe to brush your water teeth with tap water in Greece because it meets EU standards. Even if the water tastes slightly brackish because it comes from a desalination plant, it is still safe to brush your teeth with and to drink.
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Drinking waterThey in fact rely on having water delivered to them. Needless to say, bottled water is a popular product on Santorini! We recommend that you always use bottled water for drinking. Washing up and brushing your teeth can be safely done using tap water throughout the island.
Where in Greece has the clearest water? If clear water is what you're after, head to Balos Beach in Crete, which has some of the clearest water in Greece. What's better, Corfu or Crete? Both Corfu and Crete have incredible Greek beaches.
Other experts state that despite toothpaste containing a small amount of water that will naturally foam the paste, wetting the brush prior to cleaning can make the experience that bit more comfortable.
In general, tap from tap varies. Meaning, never drink from a bathroom tap when staying at a hotel because the water might come from a tank. Where I live, the water is not okay to drink - we even use bottled water when boiling pasta or beans, but we do use tap water to brush our teeth.
Is it safe to drink the tap water in Greece? In Athens and most places across mainland Greece, the tap water is perfectly safe to drink. In harbor towns and the Greek Islands, however, it is generally better to drink bottled water, which is readily available and very cheap.