How White Can Teeth Get? The Principles and Limits of Teeth Whitening

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I am the director of Seoul Bardi Dental Clinic.

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The question I hear most often during whitening consultations

is just one:

"How white can they get?"

Knowing the answer accurately

can determine whether you will be satisfied

or disappointed with whitening.

To give you the conclusion first,

there is a definite limit to teeth whitening.

Teeth that are as white as a sheet of A4 paper cannot be achieved in natural teeth,

no matter how many times whitening is repeated.

This is not a matter of the dental professional's skill.

It is a limitation that comes from the principle of whitening itself.

Today, I will explain

① what kind of procedure whitening is,

② why the results differ from person to person, and

③ how bright teeth can become,

along with clinical evidence.

| Chapter 1. Whitening Does Not “Paint” the Color; It Removes Pigments |

First, you need to understand how whitening works.

Our teeth consist of enamel on the outside

and yellowish dentin inside.

Whitening agents, such as hydrogen peroxide,

penetrate into the teeth

and break down the pigment molecules that cause discoloration.

As the smaller pigment particles reflect less light,

the teeth appear brighter.

(ADA, 2022 / StatPearls, 2024)

The key point here is that

whitening does not paint the teeth

an artificial white color.

Example image

It removes pigments within the tooth's natural

color range

to make the teeth as clear and bright as possible.

What primarily determines tooth color is

not the enamel on the outside,

but the dentin inside.

Whitening cannot completely change

the dentin's natural color.

(escholarship, UCSF)

Therefore, if you want teeth as white as A4 paper,

you need to cover the tooth surface itself with veneers

rather than undergo whitening.

| Chapter 2. Why Do Whitening Results Differ from Person to Person? |

"My friend had whitening and her teeth became brighter,

so why are mine still so yellow?"

Just as people's skin tones differ even when they use

the same whitening product,

teeth differ as well.

The density and thickness of the teeth,

as well as the natural color of the dentin,

differ from person to person.

Because dentin has a major influence on tooth color,

people whose dentin has a stronger yellow tone

may reach different levels of brightness

even with the same whitening treatment.

| Chapter 3. This Is How Whitening Is Performed |

Dental whitening is performed in stages

while maintaining the safety of the teeth and gums.

1. Shade check —

The current tooth color is measured

by comparing it with a shade guide,

and the target shade is discussed.

2. Gum protection —

A protective agent is carefully applied

so that the high-concentration whitening agent does not come into contact with the gums.

Example image

3. Applying the agent and light activation —

The whitening agent is applied to the tooth surface,

and light is directed onto it.

4. Repetition and finishing —

The process is usually repeated 2–3 times

for 15–20 minutes per session while checking the color change,

and is finished with a desensitizing treatment.

There is a reason we emphasize

“gum protection” and “desensitization.”

The most common side effects of whitening

are tooth sensitivity

and gum irritation.

(Cochrane Review, 2018 / ADA)

These are usually temporary

and subside when whitening is stopped,

but they are more likely to occur with higher concentrations

or excessively repeated treatments.

That is why it is important

not to skip the safety steps.

| Chapter 4. Will Teeth Keep Getting Whiter If Whitening Is Repeated? |

Many people ask,

"Will my teeth become whiter if I repeat whitening several times?"

That is true up to a certain point,

but once that point is exceeded,

the teeth will not become any brighter.

A tooth shade guide uses smaller numbers

to indicate lighter shades.

If your teeth currently have a strong yellow tone,

2–3 whitening sessions may bring natural teeth

up to A1, the lightest shade that natural teeth can typically reach.

(Of course, this varies from tooth to tooth.)

However, once the teeth have reached A1,

repeating the treatment 100 times will not produce

the artificial white color of veneers.

This is because natural teeth have a limit

to how bright they can become by removing pigments.

If you continue excessively beyond that limit,

rather than becoming brighter,

you may only experience increased sensitivity

and gum irritation.

| Chapter 5. Whitening Is Not Permanent |

Whitening effects

do not last a lifetime.

When teeth are exposed to pigmented foods and beverages

such as coffee, tea, and wine,

their color gradually returns.

The duration varies considerably from person to person,

but it is generally considered to last

from several months to several years at most.

(NHS, 2023)

< Differences Between At-Home Products and One-Day In-Office Whitening >

Therefore, rather than trying to make the teeth excessively white all at once,

it is better for dental health

to find an appropriate level of brightness

and maintain it through subsequent care.

In closing

To summarize,

whitening has clear limitations.

Whitening is a treatment that removes pigments

within the natural color range of the teeth

to bring them up to the lightest shade, A1.

It is not a procedure for creating

an artificial white color like that of celebrities.

It may be easy to attract people with claims that

teeth will become “pure white,”

but I cannot make such irresponsible statements.

In my view,

the most successful whitening treatment

is finding a natural level of brightness

that makes others think,

“Your overall appearance looks cleaner and brighter.”

Without unnecessary treatment,

I will honestly assess and explain

how far the “best achievable brightness”

can be reached based on the condition of your teeth.

Thank you for reading this long post today.

[References]

American Dental Association — Whitening (Oral Health Topics)

Cochrane Systematic Review (2018) — Side effects of at-home whitening products (tooth sensitivity and gum irritation)

StatPearls (2024), NCBI — Mechanism of tooth whitening

UK NHS (2023) — Duration of whitening effects

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