Hello, Chlorhexidine is known to cause staining of teeth. I do not recommend staying on chlorhexidine for a long period of time for my patients for this reason. If you find this is the only means to control your plaque, then you will have to go more often for professional dental cleanings. I suggest you use chlorhexidine for limited periods of time or try and use it in the areas where you have the most plaque only. Try to find out the cause of your difficulty with plaque. Do you have habits that contribute to plaque buildup? Dry Mouth can cause much thicker plaque to form with less saliva present. There are many dental products out there for dry mouth from rinses and toothpaste to gum. Make sure you practice good daily dental hygiene. Increase the amount of brushing, use interproximal cleaners, vigorous rinsing and you must floss. If you re periodontal condition is satisfactory consider Whitening your teeth. This can be done in the dental office or by using whitening products sold in stores. Many toothpastes incorporate a whitening ingredient. Whitening strips are popular and easy to use. Ask your dentist which procedure is suitable for your condition. There are precautions to follow when considering whitening and you should review this with your dentist. I hope you find this information useful and will benefit from my suggestions. Thank you for your inquiry.