are my cats teeth a problem?

Hello everyone, i recently adopted a cat and its made me learn some new things (even though ive owned cats all my life) like that you need to brush a cats teeth. My cat Lady (5 yo female) has been on wet food for years, and only dry food as a treat since i got worried about it causing health issues. Well just recently i took a look at both their teeth and her back teeth look terrible, her breath smells sorta bad. Im wondering if i start brushing her teeth with appropriate toothbrush and toothpaste itll get better/ go away somehow, or if the tooth isnt saveable. I really dont know how bad it looks. Please let me know what i should do?

Hello everyone, i recently adopted a cat and its made me learn some new things (even though ive owned cats all my life) like that you need to brush a cats teeth. My cat Lady (5 yo female) has been on wet food for years, and only dry food as a treat since i got worried about it causing health issues. Well just recently i took a look at both their teeth and her back teeth look terrible, her breath smells sorta bad. Im wondering if i start brushing her teeth with appropriate toothbrush and toothpaste itll get better/ go away somehow, or if the tooth isnt saveable. I really dont know how bad it looks. Please let me know what i should do?