Q. Dear Dr I had a sinus lift today on the right, when the surgeon opened the gum he found out a bigger loss of bone than he expected and after he did the sinus lift he filled the gap around the tooth with synthetic collagen which he explained has 50% success rate to stick to the bone. When I came home I was all right for the first 10 hours and then I started feeling the collagen leaking in my mouth. It’s not a lot, but it has been dropping in my mouth for the past 2 hours so I wonder what has happened. Is it possible that a stitch got undone. I ate much earlier – around 7 hours after the op. I did rinse with a mouthwash as I had a lot of blood in my mouth, and I think after the rinsing I started feeling the collagen in my mouth. Have I messed it all up now? I can’t see my surgeon till Sat, he is off tomorrow, and I’m so worried I can’t go to sleep. I will be grateful for your advice. With thanks,