In study, 258/568 #COVID19 patients (45%) had gum disease (periodontitis). The odds ratios for COVID complications in patients with periodontitis were 3.67 for all complications, 3.54 for ICU admission, 4.57 for ventilator requirement & 8.81 for death https://www.dentistrytoday.com/news/industrynews/item/7756-gum-disease-linked-to-covid-19-complications
Gum Disease Linked to COVID-19 Complications

COVID-19 patients are at least three times more likely to experience complications if they also have gum disease, according to an international team of researchers.

https://www.dentistrytoday.com/news/industrynews/item/7756-gum-disease-linked-to-covid-19-complications
Original study by Marouf and colleagues: https://onlinelibrary.wiley.com/doi/10.1111/jcpe.13435
#periodontitis
Association between periodontitis and severity of COVID‐19 infection: a case‐control study

Background COVID‐19 is associated with an exacerbated inflammatory response that can result in fatal outcomes. Systemic inflammation is also a main characteristic of periodontitis. Therefore, we...

https://onlinelibrary.wiley.com/doi/10.1111/jcpe.13435
Note that #periodontitis is linked to different systemic diseases as it can increase systemic inflammation & "periopathogenic" bacteria (that accumulate in periodontal pockets) can reach different parts of the body and cause complications
https://pubmed.ncbi.nlm.nih.gov/25534621/ 
As stated in the article of @DentistryToday, if a causal link is established, maintaining periodontal health may become an important part in COVID-19 care. Oral bacteria in patients with periodontitis can be inhaled and infect the lungs, particularly when using a ventilator.
P.S. the above-mentioned odds ratios were adjusted for age, sex, smoking, BMI, diabetes and comorbidities.
Finally, some genetic factors that increase the risk of disease are shared between periodontitis and systemic diseases.
https://pubmed.ncbi.nlm.nih.gov/32385877/ 
Could there also be overlap in gene variants that increase susceptibility to periodontitis and severe COVID-19?
The role of inflammation and genetics in periodontal disease - PubMed

Periodontitis is a complex disease: (a) various causative factors play a role simultaneously and interact with each other; and (b) the disease is episodic in nature, and bursts of disease activity...

https://pubmed.ncbi.nlm.nih.gov/32385877/
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