 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  or gets worse.The side effects of Peridex Mucous Membrane: Tooth/tongue staining, increased tartar, mouth/throat irritation, dry mouth, and change in taste of food/drinks may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To decrease staining of teeth and mouth surfaces, brush with toothpaste 3 times daily, brushing more on the stained areas. Use of a "tartar control" toothpaste and electric toothbrush may be more effective. See your dentist at least every 6 months for tooth cleaning/tartar removal. Staining from this medication that may occur on dental work (such as crowns or veneers) usually can only be removed by a dentist/hygienist. To decrease the effect on how food tastes, eat first, followed by tooth brushing and then chlorhexidine rinse. Remember that this medication has been prescribed because your doctor or dentist has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious </s>