Why use activated charcoal powder. Whiten your teeth and keep your mouth healthy. Add a little activated charcoal powder to your toothpaste every day to remove stains and for minor mouth pain. Keep your skin and hair healthy and fresh. Mix a scoop of charcoal powder with coconut or other oil and a little water for a soothing face mask or a cream for your skin and hair. Help with digestion. Mix in your favorite drink to help with digestion and to reduce gas and bloating. Bites, burns, mix with water and apply to skin to ease pain and itching. Accidental poisoning. Take with water after accidental poisoning or overdose.