The reason that your breath may smell bad after a tooth extraction is that proper home care is not being used. General brushing and rinsing with salt water should help. If bad breath continues, then you should see your dentist as there may be a possible infection.
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It is probally dry socket. You should call your dentist if it hurts real bad, and they do this process where they pack your teeth. It will dissolve on its on and it will feel much better. If it doesn't hurt, and it has been enough days, you can try to irrigate your teeth.
If your breath smells unusually bad you might have an infection in the socket where your tooth was extracted. You should call your dentist if your breath smells. Your mouth might taste bad too. The day of the extraction your mouth will taste bad and your breath will smell bad but it will usually smell like gauze and blood. Make sure you wash your hands before and after changing the gauze, before you eat, and any time your hands are going to touch your mouth.
(I am not a dentist. I have had an infected socket after a tooth extraction.)
People who brush their teeth might be overdoing it. Thus damaging the gums, which could lead to bad breath. Or, their teeth could just be smelly as a result of not flossing occasionally. Some people only think that they have bad breath when really they do not, or it's not as bad as they imagine.
Conversely, some people assume that their breath isn't really that bad, when actually, their breath smells terrible.
It hurts because the dentist puts a numbing shot in your mouth and then you hear a cracking sound.
Tissue is attached to it. The tissue is either ripped off or cut with extraction device. When pain deadener wears off you will know it.