A mosquito has no "teeth" as we describe them (for chewing food).
As larvae, mosquitoes have cutting edges on their mouthparts, which they used to feed on algae and bacterial layers. An adult mosquito feeds on nectar or other sugars (fruit juice) using its long proboscis. In the female mosquito, the proboscis contains a fascicle with cutting edges (stylets) which allows it to pierce the skin of animals such as humans, to obtain a blood meal. This blood provides protein for the formation of the mosquito's eggs.
Unlike a hypodermic needle, the proboscis cannot plunge through skin. There are 4 sets of cutting edges and 2 separate tubes: for injecting anticoagulants and for siphoning blood from the wound.
According to a book by noted author Isaac Asimov, there are a total of 47 cutting forms, some analogous to animal incisors. But they are piercing tools, and do not bite or chew anything as human teeth do.
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