Is one able to whiten teeth with little or no enamel? Such as with charcoal toothpaste?

If no enamel is on the teeth, your teeth will not get whiter. Dentin or root surface will not bleach, with bleaching products , or charcoal tooth paste, as a matter of fact it can cause sensitivity which you do not want.for permanent bleaching, you need to explore dental bonding or porcelain restoration such as veneers.

It will be difficult to whiten with little to no enamel. I wouldn't suggest a charcoal toothpaste because it can be very abrasive and destroy whatever remaining enamel you have left. You may consider veneers as a solution to having whiter teeth while also covering any areas without enamel.

Teeth whitening in cases with little enamel is possible but ensure to consult a senior cosmetic dentist who is an expert in this realm of dentistry as there can be sensitivity related issues. Dental clinics like FMS Dental Hospitals with senior and experienced cosmetic dentists, who have been practicing similar cosmetic procedures for two decades and above can handle such difficult cases with ease.