Here is a new to me herb that I'm growing this year.
Toothache plant is said to numb the pain receptors -- good for toothache, also good for if you (accidentally) eat something that is too hot/spicy for your mouth.
I have to go review the email from the person who gave me the seeds. I forgot if he said to use the buds or the leaves. I think he said to dry the seed heads whole and crumble to sow.
Here's a link describing the toothache plant Spilanthes acmella. The leaves are used.
https://herbsarespecial.com.au/free-herb ... plant.html
https://herbsarespecial.com.au/free-herb ... plant.html