I found this gem from a passage at p. 58 of A New History of Shinto by John Breen and Mark Teeuwen :
“… the Hakami Shrine located within the great Shittennoji temple within Osaka. Hakami was a tooth kami whose cult required toothache sufferers to make a paste of soy beans and bury it in shrine ground. Supplicants prayed to Hakami to release them from pain, at least until those pasted beans sprouted.”
[…] Did you know that Japan has its own tooth fairy too? (Source: This blog) […]