<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <!--Contains document type definition-->
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><!--means XHTML document is enclosed by the html tag-->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!--this meta tag specifies the character set as utf-8 like in html-->
<title>Private Medical Park Dentistry</title>
</head>
I had an error in w3 validator says:Error: Bad value Content-Type for attribute http-equiv on XHTML element meta. From line 5, column 5; to line 5, column 74 head>↩
It wasn't until I was going to post my answer that I noticed that it was asked 10 months ago. I hope you already have solved the problem.
The code that you published validates (if you add a body and a closing html-tag).
Maybe you have an illegal invisible character in there, that was filtered out when you posted it here?