| Activity | Gestational age | Data collected | Intervention |
| Baseline survey | 8 - 19 weeks (=T1) | QD at T0 QD at T1 OB at T1 | Show an educational video for prevention of PD and teach toothpick brushing method using a dental model |
| Plaque check #1 | 4 or more weeks after T1 | OHI-S #1 | Show stained plaque and correct brushing |
| Intermediate survey | 20 - 29 weeks (=T2) | QD at T2 OB at T2 | Consultation if necessary |
| Plaque check #2 | 4 or more weeks after T2 | OHI-S #2 | Show stained plaque and correct brushing |
| Final survey | 30 - 38 weeks (=T3) | QD at T3 OB at T3 | Consultation if necessary |