Dear friend.
Thanks for sharing your concern.
your history suggests that you have developed ulceration and pigmentation on under side of your tongue and gums.
here i would suggest you to visit your
dentist as soon as possible,get a
biopsy done for the lesion under the tongue.
Also if you have any jagged tooth it is better to get that treated at this stage only.
wait for your biopsy results.
meanwhile follow very good
oral hygiene measures as it appears that you have
gingivitis too.
if possible, it is better to get cleaning done(scaling).
please start with vitamin B FOR 15 days.
Later on after exact diagnosis treatment modalities can be planned.
hope it helps.
take care.
thanks