It's in the Post: When a Damaged Tooth Needs Additional Support
When too much of a tooth's structure has been lost for a filling to be successful, it's generally restored with a dental crown. When there's too much loss to support a crown, a tooth will often be extracted and replaced with a dental implant. But neither of these scenarios might accurately describe the issue with your particular tooth. There's a middle ground, and your dental clinic might suggest that your tooth be repaired using the post and core method.