Fuente: WIPO "essential oil or extracts" Exemplary applicator devices for applying topical oils to an individual are disclosed herein. Some embodiments of an exemplary applicator device may include a topical oil container and a roller-ball applicator coupled to the container. The roller-ball applicator may include a roller-ball housing, a roller-ball within the housing, the roller-ball being freely rotatable within the housing, and a retention cap configured to retain the roller-ball within the housing.