Why Are My Teeth Stained? The Complete Guide to Tooth Discolouration
- Dr. Vini Joseph
- May 22
- 3 min read
If you've been noticing your smile looking a little less bright than it used to; you're not imagining things. Tooth staining is one of the most common cosmetic concerns we see at our practice, and the good news is that most cases are very treatable. But before we talk solutions, it helps to understand why discolouration happens in the first place.
There are two main categories of tooth staining: extrinsic (surface-level) and intrinsic (deep, within the tooth structure). Knowing which type you have changes how it's treated.
Extrinsic Staining: What's on the Surface
Extrinsic stains form on the outer layer of your tooth (the enamel). They happen when pigmented compounds called chromogens which bind to the protein film that coats your teeth. The most common culprits include:
• Coffee & Tea: Both are rich in tannins, which help chromogens stick to enamel. Dark tea is often worse for staining than coffee.
• Red Wine: Contains tannins, chromogens, and natural dyes that coat and stain enamel over time.
• Tobacco: Nicotine and tar from smoking or chewing tobacco create stubborn yellow-brown stains that penetrate enamel deeply.
• Certain Foods: Berries, tomato sauce, soy sauce, and balsamic vinegar are all common staining foods.
• Poor Oral Hygiene: When plaque is not removed regularly, it hardens into tartar, a calcified deposit that appears yellowish or brown and can only be removed professionally.
Intrinsic Staining: When Colour Comes From Within
Intrinsic stains originate inside the dentin (the layer beneath enamel). These are harder to treat with whitening alone and may require cosmetic procedures. Common causes include:
• Certain Medications: Tetracycline antibiotics taken during childhood (while teeth are forming) can cause grey or brown banding inside teeth. Antihistamines, antipsychotics, and blood pressure medications can also cause discolouration.
• Fluorosis: Excessive fluoride intake during tooth development can cause white spots or brown mottling on enamel.
• Tooth Trauma: Injury to a tooth can cause internal bleeding inside the pulp, leading to a pink, grey, or dark brown appearance.
• Aging: As we age, enamel thins and dentin (which is naturally yellow) becomes more visible. This is a completely natural process.
• Dental Materials: Old silver amalgam fillings can cast a grey shadow through a tooth over time.
What Can Be Done About It?
The right treatment depends entirely on the type of staining. Here's a quick overview:
• Professional Cleaning (Scale & Polish): Removes surface buildup and tartar that regular brushing can't. A great first step for most patients.
• Professional Teeth Whitening: Highly effective for extrinsic staining. In-office bleaching achieves faster and more dramatic results than store-bought kits.
• Veneers or Bonding: Best for intrinsic staining that doesn't respond to whitening. A thin porcelain shell or composite resin can completely change the colour of a tooth.
• Addressing the Source: Reducing coffee/tea intake, quitting smoking, and improving brushing habits all help prevent new staining from forming.
Tips to Keep Your Smile Bright
• Rinse your mouth with water after drinking coffee, tea, or wine.
• Use a straw when drinking cold staining beverages to reduce contact with enamel.
• Brush twice daily and floss once daily, consistently.
• Book a professional cleaning every 6 months.
• Talk to your dentist before using whitening toothpastes, some are too abrasive for daily use.
Not Sure What's Causing Your Staining?
Every smile is different, and the best way to find out what's going on with yours is a proper examination. At Vini Joseph Dentistry, we take the time to understand your goals and recommend a treatment plan that actually fits your life and budget.
📞 Call us: 905-417-5557
📍 Location: 9699 Jane St #29, Maple, ON L6A 0A4
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