(b) Whenever by the provisions of this chapter an insurer may use a policy form without obtaining the prior approval of the superintendent, the superintendent may, after notice and hearing given to the insurer, order the insurer to cease using such policy form, if the use of such form is contrary to the requirements applicable to such form at the time of the effective date of such order. Any such order shall be effective at the expiration of such period, not less than ninety days after the giving of a notice of cessation, as the superintendent shall in such notice prescribe.