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White’ waste can in fact be separated into two further waste streams – amalgam and gypsum.
The former is the metal material used to fill teeth, although it is decreasing in popularity due to its poor aesthetics.
As amalgam releases low levels of mercury vapour, which has been associated with adverse effects in the brain and kidneys, it is important to segregate and dispose of all waste amalgam carefully, ensuring it is in a sealed container so as to protect staff and patients alike. Regarding gypsum waste, dental study models are made from gypsum – this was banned from normal landfill in 2009 as it can produce sulphide gas when mixed with biodegradable waste. It is therefore distinguished as high sulphate waste and must be disposed of separately.