In tooth resorption mineralized tooth tissue is destroyed without the presence of bacteria. Resorption is often very progressive. Timely treatment is key to preventing discomfort for the patient or premature tooth loss. Resorption can be categorized into principal external and internal types of resorption, that are further subdivided. Clinical and especially radiological examination can help determine these different types of resorption, each with its own cause. Each type of resorption requires a specific treatment. It is, then, essential for the practitioner to recognize the condition in a timely manner, make a correct diagnosis, and initiate the appropriate therapy.