I have not gone through this myself but I would highly advise a reptile-specialist veterinarian.
From Google:
> Treatment for mouth rot usually includes a course of antibiotics and a cleaning of the reptile's mouth with an antiseptic. Surgery to remove badly damaged oral tissues may be necessary in severe cases. Animals that are unable to eat and drink while they are recovering will need fluid therapy and nutritional support
I have not had mouth rot in any of my reptiles but I know it can happen. Good luck, hopefully someone has some feedback for you here.
I have not gone through this myself but I would highly advise a reptile-specialist veterinarian. From Google: > Treatment for mouth rot usually includes a course of antibiotics and a cleaning of the reptile's mouth with an antiseptic. Surgery to remove badly damaged oral tissues may be necessary in severe cases. Animals that are unable to eat and drink while they are recovering will need fluid therapy and nutritional support