My EBF toddler is extremely cavity prone, and I feel so guilty

My 18-month-old toddler just had two teeth pulled out, crowns in her top and bottom molars, and fillings on her front teeth. It has been less than a week since she had all this done, and I’m starting to see signs of more breakdown in areas that are her natural teeth.

We brush twice a day (and extra if she ends up eating before bed again for whatever reason), she drink a few sips of watered down juice maybe once a week, and if she has the occasional sweet snack her teeth get wiped down.

My fiancé, dentist and dental assistant, all say that it’s because of my breastfeeding and I feel absolutely awful and regret ever breastfeeding her. She’s very attached to the boob and pretty much nurses through the night.

I’m at a point where I wish that I had formula fed from the beginning so that my baby wouldn’t have to deal with this. I’m devastated and think it might be time to end my breastfeeding journey, but I don’t even know how to do it with my extremely attached toddler.

Advice is appreciated for this struggling mom 😢

Update:

I guess for extra context we’ve basically been dealing with this since she started teething. Her teeth came in with white stains, kinda like calcification spots.