<s>[INST] Hello- Can taking Vitamin B supplements stain your teeth? I started taking more B12 (1000 units a day) about a year ago and my dentist has noticed more staining on my teeth during cleanings. I also started using COQ10. We re trying to figure out (as my diet hasn t changed) what s causing the stains. Also, about a year ago, I started a new regiment for HIV---Triumeq (which consolidates three pills into one) so I m just trying to figure out how to stave off the stains per my dentist. Thank you! [/INST] Hi. Thanks for the query. The medication that you are taking are not seen to cause staining of teeth rather it can be due to causes like roughness of teeth with age, improper brushing technique, using mouthwash can also at times cause staining and the most common is poor oral hygiene maintenance.However, if you are taking any iron supplements then it can cause staining of teeth. Excess intake of tea and coffee, smoking etc. can cause staining of teeth. You should first learn a proper brushing technique from your dentist and go for regular dental cleaning that is every 6 months... Use a mixture of HY Chat Doctor. . Eat more of hard fruits as they have cleaning action on teeth and along with it  </s>