First (or ‘baby’ or ‘milk’) teeth usually start to appear when your child is around 6 months old. All 20 baby teeth should appear by the age of 2. For more information, see our leaflet ‘Tell me about Dental care for mother and baby‘. The first permanent ‘adult’ molars (back teeth) will appear at about 6 years, before the first baby teeth start to fall out at about 6 to 7. The permanent ‘adult’ teeth will then replace the ‘baby’ teeth. It is usually the lower front teeth that are lost first, followed by the upper front teeth shortly after. All permanent teeth should be in place by the age of 13, except the ‘wisdom’ teeth. These may appear any time between 18 and 25 years of age. All children are different and develop at different rates.