You could do with identifying the bugs before treatment so you know what you're up against. Take some to the hardwear shop or failing that the garden centre. Once you know what they are & where they come from you stand a chance of a permanent solution.
These could be woodworm, if you can see brown dust on the floor under the furniture? & you would need a specialist treatment from the hardwear shop. Or throw out the furniture before it infects the house!
Or more generally try a flea spray for treating the house. Spray onto the furniture, it kills on contact & has a residual effect for 3 to 6 months.