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Not many snails will eat a healthy plant, but they love to munch on decaying bits of plants. I have a bunch of pond snails in my planted tank, they don't do any harm.
A lot of snails mean you are over feeding or there is a lot of decaying plant matter. Snails generally do not eat healthy plants. Also if you want to get rid of snails get a 1 to 3 assassian snails. My LFS store recommended them to me and I will get them in a couple weeks cause I found a few teeny tiny snails after adding plants 4 months ago. I even cleaned and washed my plants for over 15 minutes and still at least one snail or egg survived uugh. Oh well.