Pens with brush-on or foam-tip applicators provide what has been billed as fuss-free instant whitening. Used directly after meals or in daily regimens, as alternatives to whitening trays and strips, these whiteners are often considered instant "antidotes" to new stains from food, especially just-consumed red wine.
But dental professionals are divided as to the effectiveness of paint-on whiteners. Some consider them useful adjuncts to in-office or tray bleaching. Others have yet to see any meaningful results with these whiteners. Consumer Guide to Dentistry
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