Baby bottle tooth decay, or BBTD, is a severe condition resulting from prolonged exposure of your infant’s teeth to liquid containing sugar. These liquids include milk, breast milk, formula, juice, and other sweetened drinks. Putting your infant to sleep, whether for a nap or bedtime, with a baby bottle containing anything other than water can result in severe and rapid tooth decay. The sugar pools around the teeth, allowing the plaque to produce acid that attacks their tooth enamel.