White Spots on Teeth: What Causes Them and What Can Help

By Dr. Boris Zusin · Published August 1, 2026 · Updated August 7, 2026

White spots on teeth are one of those things patients often notice and worry about without knowing what's actually causing them — and the right response really depends on the cause.

Early Demineralization (Incipient Decay)

One of the most common causes is early enamel demineralization — essentially the first visible sign that a cavity is starting to form, before it's progressed to an actual hole in the tooth. Caught at this stage, it can sometimes be reversed with fluoride treatment and better oral hygiene, or treated with Icon resin infiltration — a newer, no-drill option that arrests the lesion in a single visit.

Fluorosis

Mild fluorosis, caused by getting more fluoride than needed while teeth were still developing in childhood, can leave faint white streaks or spots that are permanent but purely cosmetic — not a sign of decay or a health concern.

Plaque Buildup After Braces or Aligners

White spots that appear in a distinct pattern after braces or clear aligners come off are usually a sign of plaque that built up around brackets or trays during treatment, demineralizing the enamel underneath in that specific spot. Read more about treating post-orthodontic white spots.

What Treatment Looks Like

Depending on the cause, options range from fluoride treatment and improved hygiene (for early decay), to Icon resin infiltration — a single-visit, no-drill treatment that both arrests the lesion and improves its appearance — to cosmetic options like whitening, microabrasion, or bonding for fluorosis or old demineralization scars. We'll take a look and let you know which applies to your situation.

Curious what's causing yours? Schedule an exam, read more about how Icon resin infiltration works, or learn about fluoride's role in preventing decay.