Symptoms & conditions
Metallic taste in mouth
The short answer
A persistent metallic taste can come from active gum disease (most common dental cause), certain medications (metformin, some antibiotics, antihistamines), sinus infection, acid reflux, pregnancy, or amalgam filling corrosion. A dental exam rules dental causes in or out in 15 minutes; if clean, the next stop is your GP.
What's happening
The clinical picture
Taste perception is a complex loop between mouth, olfactory nerves, and brain. A metallic (or "old-penny") note almost always means a metal ion is elevated somewhere. Common dental sources: bleeding gums releasing iron from blood; a failing old amalgam filling or crown with metal corrosion; or bacterial metabolism in deep gum pockets producing metallic-tasting compounds. Non-dental: metformin for diabetes is famous for it; several antibiotics (especially metronidazole and clarithromycin) cause temporary metallic taste that resolves when the course ends; pregnancy hormones (first trimester) alter taste receptors. A week-long chronic metallic taste in a non-pregnant adult with no new medications is usually periodontal.
Warning signs
Contact us the same day if:
- Bleeding gums alongside the taste
- Bad breath that worsened at the same time
- Loose older amalgam filling or visible crown margin
- Recent new medication (especially metformin)
- Difficulty swallowing or sore throat
What we do
Our approach
Periodontal probing, visual check of all existing restorations, X-rays to spot corroded amalgams or hidden decay. If everything is clean we review your medication list and refer you to your GP with specific notes (e.g. "dental causes ruled out; consider sinus or GERD"). We don't replace healthy amalgams "just in case" — no scientific evidence supports it.
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