In the last year, Michigan, along with many other states in the US, instituted laws allowing people to use CBD oil without falling under the restrictions of the states medical marijuana code. CBD, cannabidiol, is one of the most common components of extract from marijuana plants, but it doesn’t have the same narcotic effects as some of the other extracts, most notably tetrahydrocannabinol (THC). Although it doesn’t possess these narcotic effects, widespread adoption of CBD for medicinal purposes has expanded. But just how effective is CBD? In many cases, we don’t know. But we do know that it’s quite effective in at least one case, as a muscle relaxant for TMJ (temporomandibular joint disorder) patients.