A cracked tooth can be caused by an injury to the face, teeth grinding or eating hard food. You should see your dentist immediately:
– Symptoms include sensitivity to extreme temperatures, intermittent pain and swollen gums; the crack is not always easy to see.
– Your dentist will assess your symptoms and examine your teeth with a magnifying glass and may use a dental dye to locate the crack.
– The crack will then be mended with bonding, a filling or a crown.
“Leaving a cracked tooth untreated may lead to more problems, pain, and discomfort over time.”
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https://www.medicalnewstoday.com/articles/322015.php