Don’t go for the bubblegum kids toothepastes, they are full of chemicals and if she swallows a lump of it, it could make her sick.
Go for something spearmint, as opposed to peppermintm so its easier on her mouth (or as my kids say, less spicy!) and start with the tiniest bit to get her used to it. Kids only need a smidgen anyway, otherwise they end up just swallowing it.
Buy her a tooth brush with a character she likes on it, to encourage brushing and get her to do it herself if you can. There are tooth brushes in supermarkets that light up so the kids know how long to brush for.
I am not sure about taking her to a dentist, she sounds very young for that but you can ask your local PHN and theyshould be able to advise you about how many teeth she should have.
each child is so different so I would not worry too much about how many she has just yet, she is only 2. I must try and count to see how many our LO has tomorrow, she is 2 and 4 months.
HTH 😀