Teeth whitening concerns

I didn't even worry about it in my twenties.

Turning 30 makes me worried about my teeth ㅠㅠ

Maybe it's because I've been living with coffee ever since I joined the company.

My teeth are becoming weak and their color is turning very yellow.

I also received whitening treatment at a dental clinic for a pretty good amount of money.

It was only effective immediately after the treatment, and after that, the tooth came backㅠㅠㅠ

I've tried so many good toothpastes, but I couldn't tell the difference in effectiveness ㅠㅠㅠㅠ

These days, not only celebrities but also ordinary people are getting laminates, but I think that's a bit burdensome and unreasonable ㅠㅠ

Please give me some tips for dental care~!!!!!!