Tooth decay can begin as soon as teeth come in, but can be prevented with good oral care. It is important to establish healthy eating habits to help keep your child cavity free. Breast milk, formula, and even natural juices all contain sugar; this is why we advise parents to never put your child to bed with a bottle or sippy cup containing anything except water. Limit sugar exposure by giving these drinks at meal time only. Limit between meal snacks, and encourage your child to drink water throughout the day.