Of Course, the adult teeth replace those sharp little baby teeth, just like humans.
It's perfectly normal. Some baby teeth just hang in there and sometimes need a little encourgment such as a hard chewy toy. Others just seem to disappear. Usually those are the ones that get swallowed or you will find on the floor.
It's all very norma. Don't worry
Am/Can Ch Kalora's Ooh La La V Cheriden "Roxie" 7 years
Marquis' I Am Arya "Layla" 21 month
Doyerdobes No Kidding V Raindance "Jaden" 6 month
and the Italian Greyhound gang