A study performed on 99 Lebanese dentists showed that although the overall mean level of mercury measured in the hair of the participating dentists (4.1 g/g) was below the safe baseline of 5 g/g, 25% of them had a mercury level above the safe baseline (Harakeh et al., 2002).
The main contributing fac-tor to high levels of mercury was the number of patients seenper day (Harakeh et al., 2002).