The way in which periods may affect your teeth and gums are quite varied.
You could find that about three to four days out from the start of your period that you experience increased soreness in your mouth, with your gums swelling and becoming more prone to bleeding. This is caused by increased amounts of hormones such as estrogen and progesterone in your body and an accompanying build-up of plaque.
On the other hand, you may find you experience little to no ill-effects at all.
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