At baseline, the eligible infant aged 6 months old will undergo clinical oral examination and their primary caregivers will be given the pre-evaluation questionnaires for 6-9 months old. The primary caregivers will then be given the strengthened MOH AG intervention for 6-9 months old infants.

Following three months, at evaluation 1, the 9-month-old infant will undergo a clinical oral examination, and their primary caregivers will be given the post-evaluation questionnaires for 6-9 months old and pre-evaluation questionnaires for 9-12 months old. The primary caregivers will then be given the strengthened MOH AG intervention for 9-12 months old infants.

After three months, at evaluation 2, the 12-month-old infant will undergo a clinical oral examination, and their primary caregivers will be given the post-evaluation questionnaires for 9-12 months old.

At baseline, the eligible infant aged 6 months old will undergo clinical oral examination and their primary caregivers will be given the pre-evaluation questionnaires for 6-9 months old. The primary caregivers will be allowed to receive the conventional MOH AG given by oral healthcare providers from the nearest dental clinic.

Following three months, at evaluation 1, the 9-month-old infant will undergo a clinical oral examination, and their primary caregivers will be given the post-evaluation questionnaires for 6-9 months old and pre-evaluation questionnaires for 9-12 months old.

After three months, at evaluation 2, the 12-month-old infant will undergo a clinical oral examination, and their primary caregivers will be given the post-evaluation questionnaires for 9-12 months old.

Anticipatory Guidance (AG) provided to the primary caregivers-infant pairs in the intervention group

The prevalence of early dental caries lesion and dental caries risk exposure between infants in the intervention and control groups.

The knowledge and practice score on infant oral health care between primary caregivers in the intervention and control groups.

The response options for knowledge items are true, false and don't know. A score of 1 will be given to correct answers and a score of 0 for incorrect and don't know answers. A higher score indicates better knowledge.

Each practice item is given 4 response options, including a never. The remaining three responses will include one correct or appropriate practice and two incorrect or inappropriate responses. A score of 1 will be given for the correct or appropriate answers, and a score of 0 will be given for inaccurate or inappropriate and never answers. A higher score indicates better practice.

In addition to individual domain scores, an overall score for knowledge and practice on infant oral health care can be determined by dividing the summed score from knowledge and practice domains by the total possible score.