In France, we are lucky to benefit from a free social protection system. Social Security only reimburses part of routine care (consultation, optical, dental, etc.) To obtain complete health coverage, there is the principle of mutual insurance.
Supplementary health insurance absorbs the remainder payable after intervention by Health Insurance. Subscribing to mutual insurance has several advantages: Obtain additional reimbursement for care covered by Social Security. Coverage of medical care poorly reimbursed by Health insurance such as optical costs, dental prostheses.