As opposed to tooth length, probably the larger factor associated with extraction ease is the configuration of the tooth's root's. If you've seen your x-ray, maybe your dentist mentioned if the roots were all separate like a tripod, or at the other extreme, fused together like a pointed ice cream cone.

With the latter, the extraction is often astoundingly simple. If the roots are separate, they simply offer more resistance form in regard to the tooth being removed.

Probably most on your dentist's mind is the thickness of the bone in the region where your tooth approximates the sinus (it may just be paper thin).

When an extraction is a struggle, it's possible that the tooth might push through the bone into the sinus (it's unlikely that an oral surgeon will let this occur). Or the thin bone may fracture and create an opening into the sinus (if this occurs, an oral surgeon will know how to close the wound so healing occurs uneventfully).

It seems your dentist has your best interest in mind. They see the potential for problems, and have referred you to an oral surgeon whose knowledge and skill will make it much less likely that any problem will occur.

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