Why is the gum area of the lower front teeth like this?

One day, when I looked in the mirror, I was so surprised to see that the color of my lower gums and teeth was strange.

I thought I didn't brush well, so I quickly and thoroughly brushed my teeth up and down carefully.

Still, there was no significant improvement, so I quickly made a scaling appointment at the dentist and received treatment.

It seems that the doctor is scraping a lot of the lower teeth, which is concerning.

Is it because of the coffee? I've been thinking about it too.

I'm worried.

Should I get teeth whitening?