We suggest using a small amount of unscented, organic oil, for example, olive, sunflower or grape seed oil, to lubricate the area and make the massage more comfortable. You can also use an unscented personal lubricant, such as K-Y Jelly™. Don't use synthetic oils such as baby oil or petroleum jelly (Vaseline)
For my first daughter, some time between 10 and 12 months I think. But now with this situation, and because I know how to look after baby’s teeth already, I haven’t brought my younger one yet (11months). Heh. If baby’s sleeping through the night, try to make sure you brush/wipe the teeth before bedtime every day:)
When I saw her 1st tooth.. But dentist told me to bring her only when she has almost a full set of teeth.