Bad breath

Is there any reason for it?

That I understand - I have never had bad breath. Or at least no one has ever told me.

I replace my tooth brush every 3 months.

And brush my teeth twice daily, floss and use mouth wash.

I keep to 6 monthly check ups at the dentists.

But my friend seems to think it is acceptable not to go to the dentist. He waits until he has a tooth ache.

I think it must be 10 years since he last went!

I write this now because I think it is getting out of hand.

There is an aura of stink that follows him around.

I swear the room has filled with this stink also. I went out of the room and just come back in.

It smells.

What can I do?