As soon as your baby's first teeth start to appear you should start brushing them twice a day with a toothbrush specially designed for babies little mouths.
Babies accept things that are familiar to them, so do let them hold a brush, without toothpaste, to get used to the feel of it, but don't be surprised if they start brushing their teeth, their hair, and even their favourite toy with it! Letting your baby watch you brush your teeth will also help encourage them to see it as a normal daily routine not to be scared of. Click here for more information on brushing