| Oral health knowledge variables | N = 709 | |
| Knowledge about the appropriate age for the first dental visit | No later than first year in life | 91 (12.8%) |
| During childhood (3 - 16 years) | 537 (75.8%) | |
| No need for this visit | 81 (11.4%) | |
| Knowledge about the benefit of different oral hygiene aids | Toothbrush | 639 (90.1%) |
| Siwak | 210 (29.6%) | |
| Dental floss | 240 (33.9%) | |
| Chlorhexidine® mouth-rinse | 267 (37.7%) | |
| Fluoride mouth-rinse | 267 (37.7%) | |
| Tooth Mousse™ | 19 (2.7%) | |
| Xylitol chewing gum | 219 (30.9%) | |
| Knowledge about benefit of fluoride for teeth | Fluoride is useful for teeth | 646 (91.1%) |
| The choice of toothpaste is based on | Flavor | 253 (35.7%) |
| Price | 113 (15.9%) | |
| Fluoride content | 307 (43.3%) | |
| Tooth-whitening effect | 191 (26.9%) | |
| Trademark | 159 (22.4%) | |
| Knowledge about smoking and its harmful effects on oral health | Smoking causes gingival inflammation | 542 (76.4%) |
| Smoking causes oral cancer | 474 (66.9%) | |
| Smoking causes staining of teeth | 581 (81.9%) | |
| Smoking has no negative effect on teeth | 155 (21.9%) | |
| Knowledge about diet | Sugar is harmful to teeth | 403(56.8%) |
| Fresh fruits and vegetables are good for teeth | 346 (48.8%) | |
| Cheese is good for teeth | 286 (40.3%) | |
| Soft drinks and juices have an erosive potential to teeth | 603 (85.0%) | |
| Knowledge about the effect of plaque on oral health | Plaque causes gingival inflammation and dental caries/cavities | 451 (63.6%) |
| Plaque only causes dental caries/cavities | 154 (21.7%) | |
| Plaque only causes gingival inflammation | 71 (10.0%) | |
| Didn’t know the effect of plaque on oral health | 33 (4.7%) | |
| Knowledge about impact of oral health on general health | Oral health of a person has an impact on his/her general health | 613 (86.5%) |