Toddler might have ate a comb bristle??

So I was doing my daughters hair (almost two) and I let her play with the comb as I was putting her ponies in. And I honestly don’t know if the piece been missing prior to me grabbing it as I usually don’t use this comb and haven’t in months. She was chewing on it as she always chews on everything so when I grabbed it back from her I noticed it missing if she did swallow it would it pass or should should I take her to the ER?