Conventional medical insurance takes filling teeth as the category of plastic surgery, which is excluded, but it can be reimbursed if you buy medical insurance that includes dental expenses reimbursement. If you don't buy medical insurance including reimbursement of dental expenses, or if you don't pass social security reimbursement, the cost of filling teeth may not be reimbursed.
In addition, if it is commercial medical insurance, dental treatment items such as filling teeth are usually excluded, because these items belong to the category of beauty. However, if dental treatment is caused by accidental injury, some commercial medical insurance may provide protection.
Generally speaking, if you want to reimburse the cost of filling teeth, it is best to consult the relevant insurance clauses or directly consult the insurance company to ensure that you can get the corresponding protection.