So this Spider-plant (Chlorophytum comosum 'Vittatum') is an indoor plant? Yes, you can tip the rootball out of the pot and take a look. Though the insect might leave the plant and pot entirely during the day and return at night. Do you know when this damage occurred? Did it all occur at one time? It would be interesting to find the insect responsible, both to identify it and learn how and where it hides.
Bacillus thuringiensis, commonly called B.t, is a 'beneficial' bacteria that only kills the larvae of moths and butterflies (Lepidoptera). It does not harm other organisms.