It may be related to the following causes.
During pregnancy, women secrete a lot of oestrogen, endocrine disorders, and capillary permeability of the gum tissue around the teeth increases, causing an inflammatory response and making the periodontal and gum tissues more sensitive to external stimuli
During pregnancy, pregnant women’s appetite increases and they eat more snacks, sweets and all kinds of acidic foods, making it more difficult to keep their mouths clean and making their teeth vulnerable to damage.
Some pregnant women have severe early pregnancy reactions, repeated vomiting and acid reflux, which changes the pH in the mouth, making the teeth vulnerable to damage.