Many dentists or hygienists provide scaling and polishing for patients at regular intervals, even if those patients are considered to be at low risk of developing periodontal disease. There is debate over the clinical effectiveness and cost effectiveness of 'routine scaling and polishing' and the 'optimal' frequency at which it should be provided.
Beirne, P., Forgie, A., Worthington, H. V., & Clarkson, J. E. (2005). Routine scale and polish for periodontal health in adults. Cochrane Database of Systematic Reviews, (1), [CD004625]. https://doi.org/10.1002/14651858.CD004625.pub2