If you silver fillings are in good condition, there is no need to replace them. But, if you would like to not see those dark fillings, they can be replaced with tooth colored composite fillings. Silver fillings are safe. These restorations are composed of mercury, silver, tin and copper. The amount of mercury released by these fillings is much less than what you are exposed to through air, food and water. There has been no evidence that these types of fillings pose a health risk.