I think i grazed the roof of my mouth with sharp food . It seems to be infected. it is very painful and giving me nerve apin in the area above my teeth. I have several teeth missing and i find some food is hard to chew and damages my gum and roof of the mouth. Do I need an anti biotic. .
With your query, since you have already mentioned you had an injury to the roof of your mouth usually it takes 7-10 days to heal till you can use some ointment like denote/Roger/McCoppin etc... for symptomatic relief. If symptoms persists kindly visit your dentist for proper treatment. You also mentioned missing it is strictly advised to get the missing teeth replaced to maintain harmony between the teeth and TMJ as well. Hope this helps you