You brush every day, maybe even twice a day, and yet your teeth still look yellow in certain lighting or photos. Annoying, but also very common.
Here’s the key thing most people miss: “yellow teeth” can come from two different places:
• Extrinsic stains: on the outside of the tooth (enamel surface)
• Intrinsic stains: from inside the tooth (dentin and internal changes)
Brushing helps a lot, but it does not solve every type of discoloration, and it does not always remove what is stuck to the enamel.
Step 1: Know what “normal” tooth color looks like
Teeth are not naturally paper-white. Enamel is slightly translucent, and the layer underneath (dentin) is naturally more yellow. So if enamel gets thinner with age or wear, teeth can look more yellow even with good hygiene.
Extrinsic stains: surface stains (the most common)
Extrinsic stains sit on the outer surface of your teeth. Think of them like “film” that builds up over time.
Common causes
- Coffee, tea, red wine, cola
- Dark berries and richly pigmented foods
- Smoking or vaping
- Some mouth rinses or iron supplements (in certain cases)
As the ADA explains, extrinsic discoloration is primarily linked to environmental factors and behaviors such as tobacco use and highly pigmented foods and drinks. 
Why brushing may not fix it
Brushing helps prevent buildup, but some stains cling tightly to enamel, especially if you drink staining beverages often, sip slowly over long periods, or snack frequently. In many cases, what you need is a combination of better stain prevention and a targeted whitening approach.
Intrinsic stains: deeper color changes (brushing will not “scrub” these off)
Intrinsic discoloration happens inside the tooth. It can be related to dentin, tooth development, trauma, or certain medications. The stain is not just on the surface, so brushing alone will not remove it.
Cleveland Clinic explains it simply: extrinsic stains affect enamel, while intrinsic stains start inside the tooth and affect dentin, with causes that can include trauma and some medications. 
Common examples of intrinsic “yellowing”
- Natural aging (dentin changes over time)
- Enamel thinning (you see more of the yellow dentin)
- Past trauma to a tooth (a single tooth may darken)
- Some medications or overexposure to fluoride during development (varies by case)
If your yellowing is mostly intrinsic, whitening may still help sometimes, but results vary, and your dentist can tell you what will realistically work.
Quick self-check: is yours extrinsic or intrinsic?
More likely extrinsic if:
• Your teeth look yellower near the gumline or between teeth
• You drink coffee, tea, or red wine regularly
• The yellowing improved a bit after a professional cleaning
• You notice stain that looks “on the surface”
More likely intrinsic if:
• One tooth is noticeably darker than the others
• The color looks uniform and “from within”
• You have a history of enamel wear, grinding, or acid reflux symptoms
• Whitening toothpaste never makes a difference
What to do next
If it’s mostly extrinsic
1. Get a professional cleaning if you have buildup or tartar. Whitening works better on clean enamel.
2. Reduce stain exposure (or at least rinse with water after coffee or tea).
3. Use a targeted whitening product consistently, not randomly.
Where Remi products can help
Remi Whitening Kit: best for typical extrinsic staining from food and drinks, especially if your routine is already solid but the color is still hanging around.
If enamel wear is making teeth look yellow
If you grind or clench at night, you can wear enamel down over time, which can make teeth look more yellow.
Remi Custom Night Guard: helps protect your enamel from grinding-related wear while you sleep.
If it might be intrinsic or sudden
If the color change is sudden, uneven, or mostly one tooth, skip the DIY guessing and get checked. A dentist can rule out underlying issues and tell you if whitening, bonding, veneers, or another option makes sense.
Brushing is necessary, but it is not the whole story. If your yellowing is extrinsic, you are dealing with surface stains from habits, foods, and buildup, and whitening plus prevention usually helps. If it is intrinsic, the color is coming from inside the tooth or from enamel thinning, and you will get better results by matching the solution to the cause.
If you want, paste your current routine (toothpaste, brush type, coffee habits, whitening history), and I’ll tell you which bucket you most likely fall into and what to try first.
