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Root resorption is the loss of the dental hard tissues (cementum, dentine and/or enamel). Whilst this is a necessary process for the exfoliation of primary teeth, odontoclastic resorption is an undesirable event in permanent teeth, resulting in irreversible tooth structure loss which usually requires orthograde and/or surgical management. This chapter provides an overview of the different types of resorption that affect the dental hard tissues. The aetiology, pathogenesises, diagnosis and management of internal (inflammatory, replacement) and external (inflammatory, replacement, surface, cervical) resorption will be discussed.