F&F, the candy manufacturer that bought Sen-Sen from the Warner-Lambert company in 1977, discontinued the production of Sen-Sen mints in July 2013. There are listings for Sen-Sen mints on eBay.com, but the mints cannot be bought at any brick-and-mortar store or online old-fashioned candy stores.
Sen-Sen mints, developed in the late 1800s by T.B. Dunn and Co., was marketed as a breath "perfume." It was more popular with men than women, and its dominant flavor was that of liquorice. In 1985, Sen-Sen mints were available mostly in small grocery stores and tobacco shops. Once the production of Sen-Sen mints ceased in 2013, candy stores sold out of their supply of the mints.