Teeth Whitening Results are subjective and vary from person to person. While teeth whitening can occasionally lighten your tooth shade by 9+ shades, most clients who whiten their teeth for the first time are likely to see a 2-6 shade change in their first session!
Over the years, teeth tend to darken as a result of wear and tear and stain accumulation. Teenagers will likely experience immediate, dramatic results from whitening. When a person is in their 20's their teeth start to show a yellow cast, which means teeth whitening may require a bit of effort. Someone in their 40's the yellow in their teeth starts to convert to brown and will need more maintenance. By someone's 50's a person's teeth have absorbed stubborn and difficult (but not impossible to remove stains)
Teeth grinding is common with people who suffer through a lot of stress or anxiety. Teeth grinding or gnashing of the teeth causes micro-cracking in the teeth and can cause the biting edges to darken. Trauma such as falls and other injuries to the teeth can cause sizable cracks in teeth, causing staining, collection of debris, and sensitivity to them.
We are all born with teeth color that ranges from yellow-brownish to greenish-grey, and intensifies over time. Teeth that are yellow-brown is generally more responsive to whitening than green-grey teeth.
These are also genetic traits that become more pronounced with age. while all teeth show some translucency, those that are opaque and thick have an advantage