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When is a night guard indicated? For patients who grind their teeth at night (called BRUXISM) and wear them down. This is usually done unconsciously and patient may not even realize it. After some dental procedures like veneers and crowns to prevent them from chipping. How does a night guard work? A night guard can be made to fit on the upper or lower teeth. It creates a small space between the upper and the lower teeth, so the patient cannot grind them together and thus helps improve the bite.