Garlic breath but no garlic

[Barquentine]

What could be causing garlic breath without first having eaten garlic?

[hussy]

you might have gum disease
keep using mouthwash and make appointment for the dentist if you have then they need to catch it before it gets any worse.
if not then it could be medical, make app with the doctors.

[cruella]

I am guessing that you may have eaten something that did contain garlic or garlic powder without you realising it.
Many Italian foods and also ready meals do contain garlic or garlic powder.
Only a thought !