A number of pieces of technical equipment were stolen from Steinbeck Dental Surgery in New Street on Wednesday, March 11.
Thieves broke into the property between 3.30pm on Wednesday, March 11, and 9.45am the following day.
Specialist equipment including compressors and washers made by Melag and Cattani were taken.
Witnesses, or anyone who is offered the equipment for sale, can call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.