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If it tore due to normal use (if you have a frenum/frenulum piercing you know what "use" implies) then your best bet would be to take it out and go in after it heals and have it pierced deeper.
Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.