With the sheer number of exterminators there are in Toronto, it will be important for you to take enough time to see which ones have a good reputation for doing good quality work and can therefore be trusted. The exterminator that you hire will definitely need to come highly recommended by others, which is exactly why you should take the time to look around online and see what you can find with regards to reviews of certain ones; this way you will be able to make certain that you have decided on the right person for the job.
You should also take the time to ask each business that offers these services for proof of licensing, because you will need to know that they are licensed to do this type of work for you. In the Toronto area you are going to have dozens of exterminators to choose from, making it very important that you look through as many of your options as possible. Once you have taken the time to read exterminator reviews online and even ask people you know if they can recommend a good exterminator, you should be able to find one that you can trust to do a good job when it comes to removing the pests in your home.