How do I care for 7 month old's new teeth?
Is there fluoride in your water? If not, your pediatrician will likely recommend a supplement since it's the AAP policy, but I think it depends on the fluoride concentration in your local water.
Toothpastes with fluoride are not recommended for kids under the age of 2. With my little one (7 months as well), we currently use a finger toothbrush (fits right over your finger so you have better control) with tap water.