Molars are among the teeth most often affected by decay, so they often need treatment from an early age. Their early decay is sometimes the reason they have to be extracted in young patients. When we lose a single tooth, the best thing we can do is replace it with an implant. The implant is placed in the bone and isn't attached to the neighbouring teeth, so it doesn't harm them – unlike a bridge, for example, which requires grinding down healthy neighbouring teeth. If a single molar has been extracted and orthodontic treatment lies ahead, it makes sense to try to close the space left by the extracted tooth with the remaining teeth. For this to be possible, the wisdom tooth on the same side must have come through in the correct position, or an X-ray must show that it is correctly angled towards the dental arch. In that case, as the space closes, the prematurely lost tooth will be made up for by the other 2 permanent molars. If the wisdom tooth on the affected side of the same jaw isn't angled in the right direction or is missing, then we recommend replacing the extracted tooth with an implant. Bear in mind that closing the extraction space of such a tooth takes quite a long time. Treatment is expected to last between 2 and 3 years.
This answer is for general information. Your own case needs an examination by an orthodontist.