My gum has come apart what do i do ?

ok so i have sum calculus tar build up behind my lower inscissors and i tried to floss yesterday and i broke off some of the calculus between my two lower inscissors an my gum on one side of my teeth between it is kinda open an i dont know what to do i called a dentist an they said i need to be a paitent to ask questions an im on hard times so i cant go to the dentist cant sumone help me ? and it doesnt hurt just tingles a little maybe a little more than tingles just alittle stinging sensation what do i do?