Submit a question Add comments If you have a question related to a past topic (see topic headings to the right), please ask it in the comment section of that post. Please only ask questions here if it is a new topic. This will better benefit other readers. Thank you! 21 Responses to “Submit a question” Clare Watts says: March 13, 2017 at 2:09 pm Hi, My dentist has recommended Invisiline aligners for me. I am concerned about the polyurethane that they are made of being in my mouth 20 hours a day. What is your recommendation for my situation, considering I try to avoid plastics as much as possible? Thank you for this site. I am most grateful for it. Clare Reply Zuri Barniv says: March 15, 2017 at 11:49 am Hi there, if you wouldn’t mind, please ask your question here, thank you! Reply Jewel Jones says: March 7, 2017 at 7:57 pm What is the difference between external and internal root resorption in a tooth? Reply Zuri Barniv says: March 7, 2017 at 9:22 pm Hi there, please ask your question under this topic here. Thanks! Reply « Older Comments Newer Comments » Leave a Reply Cancel reply Your Comment You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong> Name (required) E-mail (required) URI Notify me of new posts by email.