I've been (re)reading FOTR, and it occurred to me that Tolkien doesn't use any curse words [from what I've been able to tell], although, insults & negative comments are still made; for example, Gandalf calling Pippin a "fool of a Took", of which is probably equivalent to today's "dumba**".

So, does the concept of curse words exist in Tolkien's Legendarium? If not, is there any specific reason why, or is this just the writing style of Tolkien? I unfortunately haven't read other works of his..