Root resorption is the loss of dental hard tissues as a result of physiological or pathological clastic activity. Invasive cervical resorption is the clinical term used to describe a pathological form of relatively uncommon, insidious and aggressive resorption of the tooth, which may be asymptomatic and often undiagnosed, and occur in any tooth of the permanent dentition. It is usually a casual finding of radiographic routine or initial orthodontic records. This paper reports a case of invasive cervical resorption, and aims to raise awareness of potential occurrence of this type of lesion and highlight the importance of early diagnosis by dentists, radiologists and orthodontists who are often the first specialists to come across these kinds of images. Treatment will rely on the development of the lesion. In its initial stage, conservative therapy can be applied; while in advanced cases, radical treatment, such as tooth extraction, is the therapy of choice. The severity of the lesion will guide the choice for the best procedure.