Is breast milk before bed bad for my baby's teeth?

my daughter has 4 teeth and still breastfeeds before bed, i just took her to the dentist and they said that the sugar in the breastmilk could start to cause tooth decay if i don't brush after she nurses at night. usually i brush her teeth before we do our bedtime routine which is reading some books and nursing (then she falls asleep nursing). has anyone ever tried brushing their kids teeth while they're sleeping? i plan on nursing at night for a while and just don't want to ruin her teeth. any advice? thanks!

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