There are published studies that suggest that patients with periodontitis have an increased risk of psoriasis, but the data is still very limited. The connection between the two diseases could be the chronic low-grade systemic inflammation associated with periodontal disease.
Periodontal treatment and good oral hygiene are a benefit for all patients since it reduces the preventable burden of the systemic inflammation associated with periodontal disease.
Brooks 2018, Ungprasert et al. 2017