You also have to think about the drinks that you give your child. Fruit juice, and even breast milk, can also be filled with sugar. Some dentist even call early tooth decay as "baby-bottle decay" because it would be commonly found in children who would drink milk or juice throughout the night, which lets the sugar culminate in the mouth for over 10 to 12 hours. Doctors recommend that parents should slowly take their child off the bottle at around 14 months, to prevent any decay. But, this also means that you should be giving your child more water.