Larger fillings that have broken down or have formed decay around them may need a crown to save the tooth.
A cracked tooth may need a crown to hold it together. Be careful not to wait too long as an untreated cracked tooth can become sensitive or eventually break.
Teeth that are very sensitive, either from a lot of "wear", or from receded gums, sometimes require crowns to seal and protect the teeth from hot and cold sensitivity.
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