Teething begins before a child's first tooth breaks through the gums. It is a natural process but causes sore gums. Teething can make your child uncomfortable and cranky. Teething lasts from six months to three years.

Primary Teeth
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The first teeth start to come in when your baby is 6 to 12 months old. The first teeth are most often the two bottom front teeth. Other teeth will quickly follow. The pressure on the gums can make them swollen and tender.