A nurse is reinforcing teaching about preventing dental caries with the parent of a 12-month-old toddler. Which of the following instructions should the nurse provide?

"Position the bristles of your child's toothbrush against the teeth at a 90-degree angle."

"Use a 5-inch strip of toothpaste on the toothbrush."

"Floss between your child's teeth before brushing."

"Clean the teeth with a small, soft-bristled toothbrush."