Tooth decay first appears as white spots on the teeth. The cavity then turns a light brown color and progressively becomes darker.

Did you know that babies can get cavities? They can—usually when they go to bed with a bottle filled with milk or juice. Find out how to prevent this type of tooth decay, which is also called nursing bottle caries.

A baby's first tooth usually appears between 5 and 7 months of age. Often, the two middle bottom teeth come through the gums first, followed by the middle four upper teeth.

Periodontal diseases, also called gum diseases, are serious bacterial infections that destroy the gums and the surrounding tissues of the mouth.

Thumb sucking is normal in infants and young children. It shouldn't cause any permanent problems if your child stops by age 5.