My dentist said it had to do with your body desperately trying to fight infection and one of the areas it is easiest for infection to enter your body by is your mouth, so it goes into overdrive!
I have a root filling and it has been playing up every since I found out I was pregnant at 4 weeks- it is apparantly because my body sees it as a foreign body and is trying to get rid of it! Our bodies are amazing but slightly frustrating at times. Dentist also said that bleeding gums are likely as the pregnancy progresses due to the increased blood flow across the whole body.
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