*3.1. Clinical Data*

Saliva secretion in the group of HT patients was 32% lower than in the control group (*p* = 0.02). None of the patients had the rate of unstimulated saliva secretion below 0.1 mL/min. Moreover, stimulated saliva secretion did not differ between the groups. The concentration of total protein in unstimulated and stimulated saliva of HT patients was significantly higher than in the control group (↑46%, *p* = 0.00002 and ↑16%, *p* = 0.0003, respectively). Salivary amylase activity was considerably lower in NWS (↓50%, *p* = 0.00001) and SWS (↓114%, *p* = 0.00001) of HT patients compared to the controls (Table 2).


**Table 2.** Salivary gland function and dental indices of the patients and the control group.

NWS—unstimulated saliva, SWS—stimulated saliva, TP—total protein, DMFT—decay, missing, filling teeth, API—approximal plaque index, GI—gingival index, PPD—periodontal pocket depth, ns—non-statistically important.

IL-1β concentration in NWS and SWS of patients with HT was significantly higher compared to the controls (↑119%, *p* = 0.00001 and, ↑52%, *p* = 0.00002, respectively).

Oral dryness was more prevalent in HT women than in healthy controls (*p* = 0.003). The prevalence of eye dryness was similar in both examined groups.

The median value of Schirmer I test for the left and right eye did not differ between the groups.

The analysis of dental data showed no differences in DMFT, API, GI and PPD between the study and the control group (Table 2).
