Menthol

Most commonly known for the strong cooling sensation it brings, menthol is a naturally-occurring compound found in the oils of peppermint, spearmint, and other mint varieties. When applied to the skin or tissues like your gums or tongue (like with a cough drop), menthol is able to produce the soothing properties to help reduce minor pains and irritation. 

For these reasons, it has rightfully earned its place in...