External cervical resorption is a disease entity with an idiopathic etiology by which osteoclastic invasion cavitates teeth near the cemento-enamel junction. The lesion, if left untreated, has the potential to progress and compromise tooth maintainability. Treatment of these lesions requires access, often surgical, removal of the affected tissue, and placement of a restorative material. This case series documents 10 external cervical resorption lesions that were treated by surgical crown lengthening with concurrent placement of a resin modified glass ionomer restoration and followed for a period ranging from July 2020 to July 2024. This case series offers evidence that external cervical resorption can be treated with a high expectancty of tooth survival. Longer term follow-up will be needed to see if this treatment remains stable and predictable.