Stresses over time can weaken the tooth, causing it to break. If you have large silver and mercury fillings, these can expand and contract with temperature changes ,weakening tooth structure by creating small fractures. It’s important to restore these areas with a crown or onlay (a bonded porcelain filling) before they break. Waiting until your tooth breaks can cause an excessive amount of tooth structure to break. You can lose more tooth structure or possibly need a root canal.
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