I don’t think most if any plans would cover more than 2 since ADA recommends every six months. Most plans would be up to $5k (more for couples or families) and 2 cleanings (some only cover 1 annual visit). If you have an HSA you could use that to pay for additional visits, but you could also check with Tufts Dental School. If you’re willing to be worked on by a dental student, you can get very cheap/free dental care