When we recommend teeth whitening, one of the most common answers we hear is:
“I’ve done it before, but it didn’t really work.”
Before we decide that whitening has failed, we need to ask better questions.
Carey’s paper, Tooth whitening: what we now know, explains how peroxide based whitening works by interacting with stain molecules within the natural tooth structure. The Cochrane review on home based tooth whitening reminds us that outcomes depend on the product, the protocol, the concentration, the application time and individual tooth factors.
The evidence supports the same key message. Whitening can change the colour of natural teeth, but the result is not determined by the whitening gel alone.
So before agreeing that whitening simply does not work on you, here is what we look at.
First, the material itself. What exactly were you using, how were you using it, and had it been stored correctly? Where did you buy it, who prescribed it, and how old was it? Sometimes it is not that whitening has failed. The procedure and the protocol have failed.
Then the trays. We need to see them in your mouth and watch exactly how you apply the material, because a poor fit or the wrong technique changes everything.
Next, the teeth themselves. Were you actually the right candidate for whitening in the first place? If your teeth are covered with plaque, calculus or staining from tea, coffee or smoking, they may need professional cleaning before we can whiten the natural tooth beneath.
If you have fillings, bonding, crowns or veneers, they will not whiten. Whitening materials only alter the colour of natural teeth.
We also need to diagnose the type of discolouration. Some enamel defects, fluorosis and antibiotic staining may respond slowly, unevenly, or require a completely different treatment plan.
Then there are exposed roots. If you have gum recession, abrasion cavities or areas where the enamel has been lost, you may be looking at dentine or cementum. Those surfaces will not necessarily whiten in the same way as enamel.
Finally, expectations. What shade did you begin with, and what result are you hoping for? Your teeth are not going to respond exactly like your friend’s teeth. Some patients whiten beautifully within a few weeks. More complex discolouration can require a much longer, carefully monitored protocol.
So no. Whitening not working yet does not necessarily mean that whitening does not work on you.
It may simply mean that nobody properly diagnosed your discolouration, checked your materials, examined your mouth, or created the correct protocol for your teeth.
Whitening can work beautifully, but only when the diagnosis is right, the expectations are honest and the protocol is appropriate for that individual patient.
References:
Carey CM. Tooth whitening: what we now know. https://pmc.ncbi.nlm.nih.gov/articles/PMC4058574/
Cochrane review on home based tooth whitening. https://pubmed.ncbi.nlm.nih.gov/30562408/
