I have a bad breath, What could be the main reason & What can I do to avoid it ?

I hope specialists or doctors answer my question wisely.

It can be due to a cavity in your teeth or a stomach illness such as ulcers or gastritis. you should go to a Dentist and if there is nothing wrong with your teeth, then go a see a Gastrologist.

Please do not tell me that my dogs bad breath is due to his teeth?

I am looking for any reason except tarter build up as to why my dogs breath stinks so bad…brush them,give tarter treats, vet says tarter and teeth look good. It is not his teeth and his breath is horrific. Please help. Please, Please, Please do not respond with anything about teeth, I am looking for any other reason that people my know of. Thanks.

For chronic bad breath charcoal can help. It is available in tablet, biscuit or powder form. Also adding digestive enzymes to the diet can help. Selected foods available from your vet which aid digestion and reduce odours will also help.
Good luck!