because of this unique situation, all breast feeding mothers could benefit from individualized oral hygiene instruction, especially once teeth begin erupting around 7 months old. mother who is breastfeed with teeth throughout the night need to know how important it is to start out with a 'clean slate' at bedtime. it is imperative that the nighttime brushing routine is effective to remove plaque from every surface of the teeth, including between the teeth with flossing.