Abstract: The present invention is an environmental protection sanitary toothbrush composed of one handle with a broader separation part on the upper end. The spiral adjustable part with a toothbrush head above is equipped to the top of the separation part. The toothbrush head and the adjustable part can be connected or separated. On the outside of the toothbrush head is a soft and flexible brush sheath. The diameter of the adjustable part is smaller than the handle or the toothbrush head that allows the user to adjust or bend in accordance with the shape of the user's oral cavity, which in turn to ensure the oral cleanliness and maintain one's health. The adjustable part can smooth away the water or the foam of the tooth paste, providing comfort to the user in using the toothbrush. Also, the brush sheath and the separation part prevents the toothbrush head from contacting the air, eliminating the pollution to the toothbrush.