Myrrh gum, like frankincense, is a resin. This fragrance was used in places of worship to help purify the air and prevent the spread of contagious diseases, including those caused by bacteria in olden days. In addition to its pleasant, warm, and earthy scent, myrrh oil may also have several health benefits. Studies suggest that it may help kill harmful bacteria, parasites, and other microbes. It may also support oral health, help heal skin sores, and ease pain and swelling.