Sharp tooth pain whenever biting down?

I have braces and have had them for a while, I got elastics the other day but everything was fine until a few minutes ago. My back tooth has pretty intense sharp pain whenever pressure is applied to it. I don’t put an elastic on that tooth and am not supposed to, but it really hurts and I don’t know if there’s... show more I have braces and have had them for a while, I got elastics the other day but everything was fine until a few minutes ago. My back tooth has pretty intense sharp pain whenever pressure is applied to it. I don’t put an elastic on that tooth and am not supposed to, but it really hurts and I don’t know if there’s something wrong with the pulp or not.
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