Avoid putting your child to bed with a bottle filled with anything other than water. Formula and juice contain sugar that feeds bacteria. Clean and massage an infant’s gums once a day to help with teething and improve the chances of healthy teeth growth. Once teeth have erupted, though, use wet gauze around a finger or a clean washcloth to wipe the plaque from teeth and gums or use a soft toothbrush and very little non-fluoride toothpaste until the child is able to spit. After that, use fluoride toothpaste.