Described herein are methods for treating a dental disorder in a subject comprising administering to the subject an effective amount of a modified hyaluronan or a pharmaceutically acceptable salt or ester thereof, wherein said hyaluronan or its pharmaceutically acceptable salt or ester comprises at least one sulfate group and the primary C-6 hydroxyl proton of at least one N-acetyl-glucosamine residue is substituted with a C1-C10 unsubstituted alkyl group or fluoroalkyl group.