My dentist is going to pull a non impacted wisdom tooth he said he will need to drill a lot why its not impacted?

Degree of difficulty: Removal of teeth's degree of difficulty depends on the density of the surrounding bone, how curved the roots are, number of roots, how badly broken down the tooth is. This is especially true for wisdom teeth since it is most posterior in the mouth. Drilling may be necessary if it needs to be removed in pieces. Impacted teeth just adds another degree of difficulty to the procedure.

Hooked roots: The tooth may need to be sectioned to facilitate its removal.