Porcelain does not decay, but the tooth underneath still can, and the edge where ceramic meets enamel can stain or leak. Daily care is ordinary and specific: a soft brush, a toothpaste that is not aggressively abrasive, and floss or another cleaner that actually reaches the margin. Whitening toothpaste will not whiten the ceramic, and a hard brush will not make the edge cleaner.
The ceramic can chip if it is asked to open packages, bite nails, or cut thread. Grinding and clenching load the edges in a way toothpaste cannot fix. If those habits are present, a night guard is protection for the restoration and the opposing teeth. It is not a treatment for the habit itself, and it does not make a poorly designed edge safe.
A veneer that feels high, catches floss, or has a dark line at the gum needs an examination, not a stronger mouthwash. Debonding, a chip, or decay at the margin are repair problems. Some can be polished or rebonded. Some need the veneer to be remade. Leaving a loose veneer in place because it still looks acceptable is how the underlying tooth gets damaged.
No ceramic comes with a lifetime. The plan at the start should say what maintenance looks like, what would count as a failure, and that a later chip or stain is a clinical event, not a personal failure. Bring questions about cleaning to the visit that places the veneers, while the margins are still new and can be shown to you.
