Question

how many teeth present in a spider mouth​

Answer 1

Spiders do have two venom-injecting fangs and typically bite with both at the same time. However, in any spider smaller than a tarantula, the entry points of the two fangs will be so close together that there is little if any visible separation.

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Answer 2

Some species do (and those species are identified partially by the presence or absence of such teeth) but they don't function the way teeth would on mammals or fish, for instance. They don't surround the mouth, but function as extra tools attached to the spider's hinged mouthparts, the chelicerae, which you can envision as a sort of nutcracker. The teeth help those jaws tear, cut, or mash the prey so it can be ingested.