Whitening Toothpaste – Are They Effective?
Do whitening toothpastes work?
The Verdict: Whitening toothpastes are effective at removing extrinsic (surface) stains caused by tea, coffee, or tobacco. However, they cannot change the natural colour of your tooth or treat deep, intrinsic discolouration.
While professional whitening can lighten teeth by 5–8 shades, whitening toothpaste typically improves brightness by only 1 shade by scrubbing away surface dirt.
Marketing Myths vs. Dental Reality
Walk down the dental aisle in any Poole supermarket, and you will see dozens of boxes promising a “Hollywood Smile.” As dental professionals, we value transparency. We want you to understand exactly what you are buying so you can manage your expectations and protect your enamel.
There is a significant difference between “Whitening” (removing surface debris) and “Bleaching” (changing the chemical colour of the tooth). Toothpastes do the former; dentists do the latter.
How Whitening Toothpastes Actually Work
Whitening toothpastes generally utilise one of three mechanisms to make your teeth appear brighter:
1. Abrasives (The Scrubbers)
This is the most common method. Ingredients like hydrated silica or calcium carbonate act like fine sandpaper. They physically scrub stains off the enamel.
- The Risk: If used too frequently or with a hard brush, these can wear down your enamel, eventually revealing the yellow dentine underneath—counterintuitively making teeth look yellower.
2. Chemicals (The Breakers)
Some pastes contain Hydrogen Peroxide or Carbamide Peroxide.
- The Reality: In the UK, strict regulations limit the concentration of peroxide in over-the-counter products to 0.1%. For context, professional whitening at Dental Poole uses concentrations up to 60x stronger. The amount in toothpaste is rarely enough to have a chemical effect before you spit it out.
3. Optical Illusions (Blue Light)
Some brands use a chemical called Blue Covarine. This deposits a thin, blue semi-transparent film on the teeth. Blue cancels out yellow, making teeth appear whiter immediately. This is an optical illusion and washes off with eating and drinking.
The RDA Scale: Why “Gritty” Isn’t Always Good
We use the Relative Dentin Abrasivity (RDA) scale to measure how harsh a toothpaste is. This is crucial for long-term health.
- 0–70 (Low): Safe for daily use (e.g., standard fluoride pastes).
- 70–100 (Medium): Standard market pastes.
- 100–150 (High): Many “Whitening” and “Tartar Control” pastes fall here. Use with caution.
- 150+ (Harmful): Potential for significant enamel damage.
Dental Poole Advice: If you have sensitive teeth or gum recession, avoid high RDA whitening pastes. The short-term brightness is not worth the long-term abrasion.
Comparison: Whitening Toothpaste vs. Professional Whitening
| Feature | Whitening Toothpaste | Professional Whitening (at Dental Poole) |
| Mechanism | Physical abrasion (scrubbing). | Chemical oxidation (bleaching). |
| Depth | Surface stains only. | Deep, intrinsic stains. |
| Time to Result | Weeks or months. | 60 mins (In-chair) or 1-2 weeks (Home kit). |
| Shade Change | Approx. 1 shade. | Up to 8 shades lighter. |
| Safety | Risk of enamel wear if overused. | Controlled, safe, and monitored. |
A Note on “Natural” Alternatives
Charcoal Toothpaste
Charcoal is trendy, but often problematic. It is highly abrasive and messy. Furthermore, many charcoal pastes lack fluoride, which is non-negotiable for cavity protection. We generally advise against daily use of charcoal products.
Oil Pulling
While coconut oil pulling may reduce some bacteria, there is no scientific evidence to support it as an effective whitening method.
Conclusion: When to Use Whitening Toothpaste
Whitening toothpaste has its place. It is an excellent tool for maintenance. If you have had professional whitening and want to keep tea and coffee stains at bay, a whitening paste (used alternately with a regular fluoride paste) is a good choice.
However, if you are looking for a true transformation, toothpaste alone will likely disappoint.
Would you like to discuss safe, effective whitening options?
Book a consultation at Dental Poole today. We will assess your enamel health and recommend a treatment plan that delivers real results, safely.