whenever he opens his mouth, it smells like he just had sewage for his last meal..

we took him to the vet a few months ago for dental treatment,
and they removed 2 of his teeth, and gave him some dental chews, told us to change his food.

a few months later his bad breath is back. why’s this?
he’s a 4-year-old maltese btw.

I had all my 4 wisdom teeth remove five days ago and I had a really bad breath and taste! Is disgusting and I was wondering if is normal.also Ive been experiencing toothpain and a sting headed in one side of my jaw,the one I got stiches on.is this normal too?

Is there a home remedy to cure a bad breath problem for my Shnauzer as mentioned above…