Thanks for writing in.
I read your problem,it seems that you have deposits on lower front teeth because of that these teeth/gums became sore and you are having in that teeth/gum area.
First of all i would like to tell you that lower front teeth region and upper 1st molar tooth region is thea most common area of plaque/deposits.
So i will suggest you please visit a dentist
in your area as soon as possible and get the scaling done and follow all the given instructions after scaling.
Nothing to get worried.
Dr. Gunjan Gupta