A recent realage article located here suggests that those who are active walking tend to not only have better cardiovascular health, but also better dental health. The cause may be that active walkers have less inflammation, which leads to healthier teeth.
As mentioned previously, walking is an excellent way to travel short distances. It does not require any special equipment, and can be very relaxing. Designing streets so that they are easily walkable would go a long way toward encouraging this most basic form of transport.