I have bad breath. a thick layer on my tongue appears whenever i wake up. i have tried thrush drops, thrush tablets, corsodyl mouthwash, tongue scrape?

Dentist?: Have you seen a dentist and explained the problem to your dentist who can actually examine you, along with taking a complete dental and medical history? That's what i would recommend and the best way to diagnose your problem and suggest a remedy.

Gum disease: Gum disease (bacterial infection between the gums and teeth) is the most common cause of bad breath. Have your dentist check a periodontal screening (should be done yearly). Gerd or acid reflux would be another common cause. Research shows listerine is the best rated mouthwash for killing bacteria.

Gum bleeding: Bleeding gum surrounding teeth will lead to production of variable sulfur compounds (vsc) and cause bad breath. Thus a good teeth cleaning will help to reduce the bleeding gum and thus relieve bad breath.