When the teeth of 2-year-old baby are found to be decayed, we call this condition as decayed milk teeth. When parents find the decayed teeth of 2 years old baby, they need to bring the baby to the hospital as soon as possible, and the doctor will choose the treatment plan according to the decay degree of the teeth. 2 years old baby with decayed teeth, the dentist will remove the decayed tissue and then fill it, if it has affected the nerve of the tooth, only root canal treatment can be done, and if it is very serious and untreatable, the tooth needs to be extracted. After root canal treatment also need to pay attention to maintain oral hygiene to protect the tooth from further damage. Parents should help their 2 year olds to develop the habit of brushing their teeth after meals. Parents should guide their children to pay attention to clean mouth, teach them to learn to use a toothbrush and develop a good habit of brushing their teeth every day.