General quesiton about teeth enamel

I have recently realized what I am doing to my teeth and health by smoking, drinking soda, etc.

My teeth are starting to show the root rather than the shiny white enamel. If you have experienced this from drinking coffee, smoking, or other things- please let me know.

Also, I brush my teeth every day and for some reason there is heavy plaque build up on the bottom row. Could this be related to the types of food I eat?

What have you done to successfully have a clean white smile again?
General quesiton about teeth enamel
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