Teething is the normal process of new teeth working their way through the gums.
Your baby's first tooth may appear any time between the time he is 3 months to 1 year old. Most children have completely painless teething. The only symptoms are increased saliva, drooling, and a desire to chew on things. Teething occasionally causes some mild gum pain, but it doesn't interfere with sleep. The degree of discomfort varies from child to child.