This study will assess the acceptability of a multi-component intervention, including provision of calcium/vitamin-D fortified milk and periodontal therapy (PT), for improving maternal periodontal health and metabolic and inflammatory profiles. The IMPROVE trial is a feasibility randomised controlled trial (RCT) with parallel qualitative process evaluation. The target population is low-income, pregnant, Brazilian women, with periodontitis, who have not seen a dentist in the last 6 months. A series of focus group discussions and interviews with the target population will be conducted to identify key barriers and enablers to adoption and implementation of the intervention in prenatal clinics in Rio de Janeiro/Brazil. Participants will be allocated to 4 groups: 1) early PT (during pregnancy) plus fortified milk; 2) early PT plus plain milk; 3) delayed PT (after delivery) plus fortified milk; 4) delayed PT plus plain milk.