Mercury is a deadly toxic element. It is well known that Mercury is highly toxic - causing renal failure, muscle tremor, memory loss and even life-threatening. Now, the content of mercury in dental fillings used by dentists to fill teeth often reaches 50%. 
Mercury is also found in some seafood, alcohol, beverages and pharmaceuticals
 every responsible dentist should remove mercury containing fillings from the mouth of all filling patients, Instead, use a filler made of plastic.