II have came across different patients who used Charcoal toothpaste for few weeks and caused severe sensitivity and injury to their teeth and gum.
Few other patients starting to have decay on their teeth due to lack of fluoride in the toothpaste they were using. This goes for all natural fluoride-free toothpastes as well.
Using charcoal toothpaste very "infrequently" along with your fluorinated toothpaste might be OK. However due to thickness of enamel, the condition of gum and sensitivity, safely using charcoal toothpaste varies individually.
There are different methods of whitening which have been used for a long time and their effectiveness without damaging teeth or gum have been proven. On the other hand, there have not been many studies regarding charcoal toothpastes to show the long term results.
If you are interested in using charcoal or fluoride free toothpaste please discuss it with us so we can make sure you have a healthy, beautiful smile.