20 year old back tooth decay lost half of the tooth without pain need to fill the tooth or extract the tooth, with life care.
1. Fillings: 20 year old back teeth cavities lost half without pain, the decay has not eroded into the crown of the tooth, you can consider fillings and crown restoration, so that the tooth is back to complete.
2. Tooth extraction: 20-year-old back tooth decay lost half does not hurt, but the decay has eroded to the crown of the tooth more than one-half, need to consider extracting the tooth. If the decayed back tooth is a wisdom tooth, you can also consider extracting the decayed tooth.
3. With the care: 20-year-old back tooth decay lost half does not hurt after filling or extraction of the tooth, you need to do a good job of oral cleaning, temporary less touch the affected area. Eat more light, easy to digest food, and so on.
If you are 20 years old and have lost half of your tooth decay, it is recommended that you go to a regular hospital stomatology department in a timely manner.