It might seem hard to imagine that a bad tooth could be deadly. But doctors in the Washington area say a twelve-year-old boy died last month from a tooth infection that spread to his brain.. Experts at the National Institutes of Health say good dental care starts at birth. They say breast milk is the best food for the healthy development of teeth. Breast milk can help slow bacterial growth and acid production in the mouth. But dentists say you should clean your baby's gums and early teeth after each feeding. Use a cloth with a little warm water. Do the same if you bottle feed your baby. Experts say if you decide to put your baby to sleep with a bottle, give your baby only water. When baby teeth begin to appear, you can clean them with a wet toothbrush. Dentists say it is important to find soft toothbrushes made especially for babies. And use them very gently. The American Academy of Family Physicians says most kids stop sucking their thumbs by the age of four. If it continues, the group advises parents to talk to their child's dentist or doctor. It could interfere with the correct development of permanent teeth.Dentists strongly advise a first dental visit at least by the time a child is one year old.