Thanks for writing in.
Soreness of mouth and gums usually occurs in cases of-
Heavy intake of spicy foods.Aphthous ulcers
Oral habits like tobacco or pan chewing.
I would suggest you to get a thorough clinical evaluation done.
Meanwhile,apply topical corticosteroids
on the affected area.
Discontinue tobacco or pan chewing.
Maintain oral hygiene
Avoid spicy foods.