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Tooth decay, also known as dental caries or cavities, is a breakdown of teeth due to acids made by bacteria. The cavities may be a number of different colours from yellow to black. Symptoms may include pain and difficulty with eating. Microinvasive techniques involve preparing the tooth surface with an acid and then either placing a seal on top of the surface or 'infiltrating' the softer demineralised tissue with resins. These newer methods work by installing a barrier either on the tooth surface or within the demineralised tissue to protect it against acids and avoid the further loss...