Singaw pain (9/10) pls suggest effective remedies

good day! i just want to ask if may effective pampatanggal ng singaw 🥹 my gf has had singaw for days already. wala na siyang braces, retainers na lang now. hirap siya magsalita and she rates the pain 9/10 😭

(also she already tried doing saltwater rinses pero masakit and hindi pa rin daw nawawala)

any remedies or meds you can recommend? thank you!