Can botox be used to alleviate pain in a jaw disorder?

In their JNeurosci paper, the researchers discovered that injecting botox directly into the male mouse temporomandibular joint (TMJ) instead of surrounding muscle tissue reduced TMD-related pain without causing side effects.

More specifically, hypersensitivity and pain from TMD were mitigated without impairing general movement abilities and feeding behavior. The researchers also found that the botox injections they delivered reduced TMD-related neural activity. On a molecular level, mice that received botox injections into the TMJ had less expression of proteins that promote pain.

While sex differences remain unexplored, according to the authors, this work suggests it may be possible to overcome botox side effects by avoiding muscle tissue and injecting the toxin directly into the TMJ. 

Reference:

Eungyung Kim, Hyeonwi Son, Yan Zhang, John Shannonhouse, Ruben Gomez, BoNT injection into temporomandibular joint alleviates TMJ pain in forced mouth opening mouse model, JNeurosci, https://doi.org/10.1523/JNEUROSCI.2035-24.2025