Yes it's the correct opinion .Wisdom tooth growing in the wrong direction causes such problem. Please trust your dentist. We won't advise you to remove tooth unless absolutely required.
Next Steps
Add a pinch of salt to warm water and rinse with it three to four times a day. It will help with the pain.
Health Tips
If u do not wish to remove the tooth, you may ask the dentist to grind the portion of the tooth which is hurting the cheek. It will only provide you some temporary relief. But my advise would be not to delay and get the tooth removed ASAP.