Answered by Shaykh Shuaib Ally
Question: Is it permissible to use charcoal (of wood) / charcoal (of wood) derivative as an ingredient for a tooth whitening powder?
I pray that you are well.
You can use anything to whiten your teeth that does not cause bodily harm, or is not itself impure.
If the items you have mentioned fit that description, there is nothing preventing their usage.
God knows best.
This answer was collected from Seekersguidance.org. It’s an online learning platform overseen by Sheikh Faraz Rabbani. All courses are free. They also have in-person classes in Canada.