Things your dentist never had time to explain.

Yellow, brown or gray — and why each responds differently. The color you see is dentin showing through enamel.

One ingredient does the work: peroxide. Hydrogen or carbamide, strength × time, and the methods honestly ranked.

Charcoal, purple paste, baking soda, oil pulling, lemon, LED lights sold alone, 'peroxide-free' whitening — rated.

Crowns, veneers, bonding, tetracycline bands, one dark tooth, white spots, brown fluorosis, receded gums — and why they become the dark spot.

Why day four hurts and the seven-move protocol I give my own patients so you don't quit.

Six months to two years — you decide which. The first 48 hours, the two-week bounce-back, and the three places stain comes from.

Brush, rinse, floss — in the order that actually works, and why.

Twenty markers, one spit tube, and a conversation with a dentist.