The darkening of the teeth after taking iron may be caused by the occurrence of exogenous staining, and the pigmentation can be removed by scaling and polishing. Taking iron with a straw reduces its contact with the surface of the teeth, which can slow down the re-deposition of pigment.
The procedure of scaling is to use scaling instruments to remove the color stains on the tooth surface, including hand instrument scaling and ultrasonic scaling. After scaling, the instruments will leave small scratches on the tooth surface, which need to be polished to make the tooth surface smooth and clean, and to reduce the speed and degree of pigment reattachment, including rubber cup polishing, sandblasting polishing, and so on.
After performing periodontal scaling, taking iron can be done using a straw, which reduces the contact of iron with the tooth surface and helps to slow down pigment re-deposition.
It is recommended to visit your regular healthcare provider for professional treatment with the help of your doctor.