Written by Richard Dawson, DMD ICOI Fellow Reviewed by John Turke DMD Updated May 2026

Patient Resources -- Smile Science Dental Spa, Glendale AZ

Teeth Whitening Post-Procedural Instructions

The white diet, what to avoid, and how to maintain your results after professional whitening.

Sensitivity That Needs Attention

Some sensitivity after whitening is normal and expected. Contact us at (480) 530-3663 if sensitivity is severe, if you experience shooting or sharp pain that is not improving after 48 hours, or if you notice unusual changes to your gum tissue such as white patches or prolonged soreness. For a medical emergency, dial 9-1-1.

3 Rules for the Next 48 Hours

White diet for 48 hours -- no coffee, tea, red wine, berries, or any deeply pigmented food or drink.

Start sensitivity toothpaste today -- use it twice daily for at least two weeks after whitening.

No alcohol-based mouthwash for 48 hours -- it dries the enamel and worsens sensitivity.

Smile Science Dental Spa 20118 N 67th Ave Ste 308, Glendale, AZ 85308
(480) 530-3663  •  smilescience.com
Smile Science Dental Spa 20118 N 67th Ave Ste 308, Glendale, AZ 85308
(480) 530-3663  •  smilescience.com

Professional teeth whitening works by opening the microscopic pores of enamel and removing embedded pigment molecules. For 24 to 48 hours after treatment, those pores remain more open than usual, which means your teeth are both more susceptible to staining and more sensitive. Following these instructions protects your results and keeps post-procedure sensitivity comfortable.

The White Diet -- What to Eat and Avoid for 48 Hours

Safe to eat and drink (light-colored, non-staining):

  • Water, milk, clear sparkling water
  • White rice, white bread, pasta with cream or white sauce
  • Chicken, turkey, white fish such as tilapia or cod
  • Eggs (scrambled, poached, or hard-boiled)
  • Bananas, pears, white grapes
  • Yogurt (plain or vanilla), cottage cheese, mozzarella
  • Potatoes (mashed or baked without skin)

Avoid completely for 48 hours -- these will stain:

  • Coffee, tea, hot chocolate, dark sodas (including diet cola)
  • Red wine, grape juice, cranberry juice, sports drinks with dye
  • Berries: blueberries, blackberries, strawberries, raspberries, cherries
  • Tomato-based sauces, soy sauce, balsamic vinegar, mustard, ketchup
  • Beets, carrots, dark leafy greens
  • Chocolate and dark candy
  • Tobacco -- smoking causes rapid stain redeposition

A simple rule of thumb: if it would stain a white shirt, avoid it for 48 hours.

Managing Sensitivity

  • Sensitivity toothpaste: Begin using a potassium nitrate or stannous fluoride sensitivity toothpaste (such as Sensodyne ProNamel or Colgate Sensitive) starting today. Use it as your regular toothpaste twice daily. Results build over 2 to 4 weeks of consistent use.
  • Avoid very hot or very cold foods and beverages for at least 48 hours. Temperature extremes aggravate sensitivity when enamel pores are still more open than usual.
  • Ibuprofen 400 mg taken with food is effective if sensitivity is uncomfortable. Over-the-counter pain relief is appropriate and does not interfere with whitening results.
  • Do not use mouthwash with alcohol for 48 hours. Alcohol dries the enamel and intensifies sensitivity during the post-whitening window.

Oral Hygiene After Whitening

  • Brush with a soft-bristled toothbrush and your sensitivity toothpaste starting today. Brushing will not harm the results.
  • Do not use a whitening toothpaste for at least one week after professional whitening. Whitening toothpastes use abrasives that can increase sensitivity on already-treated enamel.
  • Flossing is fine starting today. Maintain your normal flossing routine.
  • Avoid acidic foods (citrus, vinegar-based foods) for 48 hours -- acid temporarily softens enamel and compounds sensitivity.

Maintaining Your Results Long-Term

  • Professional whitening results last 12 to 18 months for most patients, depending on diet, tobacco use, and oral hygiene habits. Patients who drink coffee or red wine regularly will see faster re-staining.
  • Touch-up trays: If take-home whitening trays were provided, use them periodically (as directed) to maintain your result rather than waiting until the whitening is fully gone. Touch-ups are easier and faster than starting from scratch.
  • Regular professional cleanings at 6-month intervals remove surface staining before it becomes embedded and keep your results lasting longer.
  • Avoid tobacco. Nicotine and tar stain teeth faster than almost any food or beverage. Whitening results degrade significantly faster in patients who smoke.

Questions at any stage of your whitening recovery are welcome. Our team at Smile Science Dental Spa is here to help. Call us at (480) 530-3663 or visit us at 20118 N 67th Ave Ste 308, Glendale, AZ 85308.

Professional teeth whitening at Smile Science Dental Spa is supervised by Dr. Richard Dawson, DMD, ICOI Fellow, and reviewed in collaboration with Dr. John Turke, DMD. If you are experiencing unusual sensitivity or have questions about your results, call us at (480) 530-3663. To learn more about our professional whitening options, visit our teeth whitening page.

Frequently Asked Questions

How long will my whitening results last?

For most patients, professional in-office whitening results last 12 to 18 months before noticeable re-staining occurs. This varies significantly based on individual habits: patients who regularly drink coffee, tea, or red wine and do not use touch-up trays may see fading within 6 to 8 months. Patients who follow the white diet recommendations, use take-home trays periodically, and attend regular cleanings often maintain results closer to 18 months or beyond.

My results look uneven -- some teeth are whiter than others. Is this normal?

Some variability immediately after whitening is common. Individual teeth whiten at different rates based on enamel density and the distribution of existing staining. Results typically even out and look more uniform within 1 to 2 weeks after treatment as the whitening settles and enamel rehydrates. If you notice persistent uneven areas after 2 weeks, call us -- in some cases, targeted touch-up whitening on specific teeth can address this.

I have crowns and veneers. Will whitening affect them?

No -- whitening agents do not change the color of ceramic crowns, veneers, or composite bonding. Only natural tooth enamel responds to hydrogen peroxide-based whitening. If you have restorations on visible teeth, it is important to be aware that whitening your natural teeth may create a color mismatch. This is why we assess your existing restorations before recommending whitening. If a mismatch is a concern, we can discuss options including replacement of the restorations to match your new, whiter shade.

My teeth feel very sensitive after whitening. Is this normal?

Yes -- sensitivity is the most common side effect of professional whitening and affects roughly half of patients to some degree. The hydrogen peroxide temporarily increases the permeability of enamel, allowing thermal and chemical stimuli to reach the nerve more easily. This sensitivity peaks in the first 24 to 48 hours and resolves completely for most patients within a few days. Using a potassium nitrate sensitivity toothpaste (such as Sensodyne) starting the day of your whitening appointment reduces the intensity. If sensitivity is severe or has not resolved after 5 days, call us.

Can I whiten my teeth again if the results fade?

Yes -- periodic touch-up whitening is safe and effective. Most patients use take-home trays with a lower-concentration whitening gel every few months to maintain their results rather than repeating a full in-office session. If it has been 12 to 18 months and your shade has faded noticeably, an in-office session can reset your baseline. There is no fixed limit on how many times you can whiten, but we recommend spacing sessions to give enamel time to remineralize between treatments. Let us know at your next cleaning and we can advise based on your current shade.

Is professional whitening safe for tooth enamel?

Yes -- when used as directed, professional whitening does not damage enamel. Decades of clinical research and regulatory review support the safety of hydrogen peroxide and carbamide peroxide whitening agents at professionally recommended concentrations. The sensitivity you may experience is temporary and does not reflect permanent damage. Whitening is not recommended for patients with active cavities, gum disease, or exposed root surfaces, which is why we assess your oral health before recommending treatment. Over-whitening beyond the recommended schedule is inadvisable, but normal professional use is safe.

These instructions were prepared by Dr. Richard Dawson, DMD, ICOI Fellow, and reviewed by Dr. John Turke, DMD. If your situation does not match what is described here, trust your clinical team -- call us at (480) 530-3663.

Questions About Your Results?

Contact our office any time. We are happy to help you get the most out of your whitening treatment.

Call Our Office: (480) 530-3663