Your tips on purging your body after the removal of amalgam fillings continue to come in. One reader suggests EDTA chelation therapy, which is usually used for clearing blocked arteries. Its original use, when it was developed during the Second World War, was to remove heavy metals from the blood of American shipbuilders who were using lead-based paints, our correspondent tells us. More from the Arterial Disease Clinic on 020 7486 1095.