the best book i have ever seen on the subject https://www.amazon.com/gp/product/1610040449/ref=dbs_a_def_rwt_bibl_vppi_i3Right now you could go to the dentist or learn to handle pain.
Things that help:
Holding a mouthful of peroxide
Holding a mouthful of vodka, then swallowing it.
Put an aspirin on it, let it melt.
A children's Tylenol melt on it.
Toothache meds from dollar store.
Penicillin every 6 hours for infection.
The ache is caused by the nerve dying. Once the nerve dies the pain stops but other issues could arise.
In SHTF try the vet if you can't find a dentist.