Most of the brown or yellow tinge left by coffee, tea and red wine sits on the surface of the teeth rather than inside them. That matters, because surface stain can usually be lifted with a professional clean, and a few changes in how you drink can slow its return. Giving up your favourite drinks is rarely necessary.
Stain starts on a film you cannot see
Within minutes of brushing, saliva proteins coat the enamel in a thin layer called the pellicle. Coloured compounds in drinks, often called chromogens, attach to this layer, and tannins help bind them there. Each cup adds a trace. Over months the layers deepen in colour, most noticeably where the brush reaches least: along the gumline, between teeth and in the grooves of back teeth. Plaque and tartar give pigment even more to hold onto, which is why stain often looks worst on teeth that are hard to keep clean.
Each drink stains a little differently
Tea
Black tea is one of the most persistent stainers. In a 2022 laboratory study in the European Journal of Dentistry (Sarembe and colleagues), which tested common drinks on human enamel alongside a chlorhexidine mouthwash, black tea and red wine produced the heaviest stain, and the tea stain was the most resistant to brushing. Milk seems to help with tea in particular: a lab study in the International Journal of Dental Hygiene (Lee and colleagues, 2014) found that adding milk to tea significantly reduced staining of extracted teeth, and traced the effect to casein, the main milk protein. Our article on matcha covers green tea powders.
Coffee
Coffee also stained significantly in the same 2022 study, though less stubbornly than black tea. Its acidity is mild, and plain coffee did not soften enamel in an earlier laboratory comparison of sixty foods, drinks and medicines (Lussi and colleagues, British Journal of Nutrition, 2012). For a closer look at the two drinks head to head, see our piece on coffee versus tea.
Red wine
Red wine brings deep grape pigments as well as acid. University of Adelaide researchers (Kwek and colleagues, Australian Dental Journal, 2015) showed that enamel began to soften after repeated one-minute exposures to wine in the lab, and erosive tooth wear is a recognised problem among professional wine tasters. Softened enamel can pick up pigment more readily, so frequent sipping across an evening is harder on teeth than a glass with a meal. White wine carries little colour but is also acidic. Our article on red wine and your teeth goes further.
When discolouration is not from drinks
Drink stain is extrinsic: it lies on the outer surface and is usually fairly even. Intrinsic discolouration comes from within the tooth, for example after certain medicines taken in childhood, excess fluoride while the teeth were forming, an old knock that has darkened a single tooth, or simply darker underlying dentine. It does not respond to cleaning in the same way, as our article on tetracycline and intrinsic stains explains.
Have it checked rather than assuming it is coffee if one tooth is darker than its neighbours, if brown or chalky patches near the gums will not brush off, or if sensitivity has appeared at the same time. Those can be signs of decay or other problems.
Small changes that slow stain down
- Drink a cup in one short sitting instead of keeping it beside you all morning, so pigment and acid have less contact time.
- Keep a glass of water nearby and take a few sips after coffee, tea or wine.
- Use a straw for iced coffee, iced tea and cold brew to keep the drink off the front teeth.
- If you take tea, a dash of milk may reduce how much it stains.
- Brush twice a day with fluoride toothpaste and clean between the teeth, so pigment has less plaque to cling to.
- After wine or other acidic drinks, rinse with water.
You may have heard that you should wait before brushing after something acidic. A 2024 scoping review in Caries Research (Fernández and colleagues) found that most studies showed brushing with fluoride toothpaste does not add measurable erosive wear, whenever it is done, so there is no need for a fixed wait. Our guide to enamel erosion covers this in more depth.
Smoking, a dry mouth from medication, rough or worn enamel and stained filling edges can all make stain build up faster, and vaping may add to it. If you notice it returning much more quickly than it used to, mention it at your next visit.
Lifting stain that is already there
Cutting back stops new stain but will not remove old layers. A scale and clean, sometimes with air polishing, by a dentist or OHT is the usual first step, and it often makes a visible difference by itself. Whitening toothpastes may soften light, recent stain but do not shift long-standing build-up. If you would like teeth lighter than a clean achieves, whitening can be discussed once the teeth and gums have been checked. Results vary from person to person. Our article on whitening for coffee and wine stains compares the approaches, and our teeth whitening page explains how professional whitening works at Lumi Dental.
To have stain assessed and cleaned, book a check-up with our general dentistry team at our Melrose Park practice, and see any new patient offers on our current offers page.
