Hello.
For about a year I have had a problem with my upper canines on the left and right sides. On the left side, about a year ago the enamel on the back of the tooth started disappearing, and it was worn away so much that the tooth eventually broke to the point that almost nothing is visible above the gum. I have a filling, but every so often it falls out. I would like to know what can be done in this case — can only a post-supported tooth be made? Now the same thing has happened to my upper right canine: the enamel on the back disappeared within three days. Today the front side also cracked, but in such a way that half of the tooth is still above the gum.
Why is this happening to me?
In general I have very strong teeth, and even my dentist finds it strange that this is happening.
Thank you very much for your answer and kind regards.

Dear Sir/Madam!

In the case of extensive damage to the dental crown, whether due to dental caries or another cause, the only and best solution is most often a dental crown, with or without a root anchor (post). A prerequisite for making a crown, however, is a relatively unaffected dentin margin that should extend at least to the level of the marginal gingiva. If the tooth is affected far below the level of the gum, the gingival margin needs to be reshaped (gingivoplasty). If the defect is still too extensive, the remaining tooth root can also be extruded using an orthodontic appliance. If all these procedures do not satisfy the basic requirement for making a dental crown, unfortunately the tooth needs to be extracted.
It would be very difficult to discuss the causes of the process you describe without an examination. If you have already ruled out carious processes, the cause may perhaps be poor enamel mineralization, absence of the enamel layer (enamel hypoplasia or aplasia), trauma...

Have a nice day!