The present invention relates to a TIPS (Twist Isolated Plate of Suction) for protecting the tongue, to a bite block, and to an intraoral illumination device having a saliva-sucking function. More particularly, the present invention relates to a TIPS for protecting the tongue, to a bite block, and to an intraoral illumination device having a saliva-sucking function, which enables a dental patient to undergo examination and treatment with the tongue thereof comfortably protected, quickly removes saliva from the throat of the patient to minimize disagreeable feelings of irritation, and isolates the tongue of the patient to the side opposite the side of the mouth to be treated, and also lightens the oral cavity of the patient to enable a dentist to perform examination and treatment with ease.