If the gap between teeth is small, it can be completed in one treatment, and the time for filling teeth is about 20 minutes. If you need to treat pulpitis, you need multiple treatments, and the total time may take 1-2 hours.

As for the cost, it is about 100 yuan to 300 yuan, depending on the materials selected and the complexity of the treatment. If it is filled with glass ion material, the safety is high, but the cost may be around 300 yuan. If you choose resin material, the cost may be slightly lower.

Please note that the above information is for reference only, and the specific treatment time and cost are determined by professional doctors according to the situation. It is recommended to consult a professional doctor in time, or go to relevant medical institutions for detailed consultation.