Dental crowns aren’t vulnerable to tooth decay, but you can’t stop brushing your teeth. Your underlying tooth and surrounding teeth can still develop cavities. Decay can occur underneath your restoration from bacteria found in tartar buildup when your crown meets your gum line. It can gain access to your tooth through small cracks that form in the dental cement over time. Good oral hygiene can keep cavities at bay. Limit your consumption of sugars and starches. Visit your dentist every 6 months to keep your mouth healthy.