Spilanthes, also known by the common names of eyeball plant, toothache plant, or buzz buttons, is an herbaceous plant that is originally native to the tropics but has since been cultivated throughout the world. The common names for this species are reflective of its characteristics (when it is flowering, it can resemble an eyeball). Likewise, this plant has a unique property that makes your mouth go numb and buzz when the flower buds are chewed. 

Historically, spilanthes was used to help cure pains associated with toothaches. It was as simple as plucking a fresh flower off the plant, chewing it up, and BAM! The toothache was cured. Originally, spilanthes was primarily used for this purpose, but as time went on, it was discovered that spilanthes had additional healing properties.© What Is Spilanthes? • InsteadingSource: https://insteading.com/blog/what-is-spilanthes/