White or coated tongue: causes and when to worry

In short: waking up with a white or coated tongue is very common and almost always harmless: it’s usually a coating, a mix of debris and bacteria that builds up if you don’t clean your tongue. Hygiene clears it. It’s only worth checking if it won’t come off, if there are patches that don’t rub away, pain or it lasts a long time.

What is that white coating?

In most cases it’s a coating: a layer of food debris, cells and bacteria trapped between the tongue’s papillae. It’s more noticeable when you wake up (less saliva is produced at night) and if you don’t have the habit of cleaning your tongue.

The most common causes

• Not cleaning the tongue: the most frequent one. The tongue needs cleaning too.
• Dry mouth: less saliva = more build-up. Happens at night, with some medicines or breathing through the mouth.
• Tobacco and alcohol: smoking dries and stains.
• Fever or dehydration: the tongue gets “coated” when you’re unwell or drink little.
• Fungus (thrush): a white layer that sometimes does rub off and leaves the area red; more common in babies, older people or those with low defences.

How to clean it

Once a day, gently: a tongue scraper or your own brush, from back to front, without pressing. Drink water and keep good hygiene in the rest of the mouth. It also greatly improves bad breath, which often starts right there.

When is it worth having checked?

• The coating won’t go when you clean it, or there are white patches that don’t rub off.
• There’s pain, burning or sores.
• It lasts weeks without improving.

In those cases, have a dentist or your doctor look. The vast majority of the time it’s nothing, but those signs are checked to be safe.

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Got a tongue with a coating that won’t go or that bothers you? Come in and we’ll take a look; getting peace of mind is quick. The first visit is free: book an appointment.