Question

Yellow substance covering the
teeth​

Answer 1

Answer:

Enamel Thinning

As the enamel layer of the teeth starts wearing down and thinning itself due to chewing, the yellow dentin is exposed making the teeth look yellower. Dentin is a deep, yellow to brown, tinged material inside our teeth under the enamel. It is the primary cause for teeth appearing yellow.

Answer 2

Answer:

Dentin is a deep, yellow to brown, tinged material inside our teeth under the enamel. It is the primary cause for teeth appearing yellow. Color changes occur when the enamel starts scraping off and more of the dentin reveals itself.