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  When cavities have shaped in your teeth,  dentists use fillings to fill them. There ar varied styles offillings, however the foremost common ones used ar amalgam and composite, additionally referred to as metal and tooth-coloured severally. An amalgam filling consists of a mixture of metals that embody copper, mercury, silver, and tin. One advantage of Associate in Nursing amalgam filling is that it’s very hard-wearing, which suggests it will stand up to the serious manduction and grinding action your back teeth will for as long as twenty years, additional or less. That’s a given if you perpetually apply smart oral and dental hygiene. Another definite characteristic of Associate in Nursing amalgam filling is that it contains solely alittle quantity of mercury, thatdoesn’t build it toxic once mixed in with differentmetals. Research has established that amalgam filling is safe and doesn't cause health issues. However, as a preventative live, pregnant girls aren'