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As I noted in my endorsement, I'm 100% with Patrick on this. I just wanted to drive home this point—do not buy links. It can work for a bit, but you will get caught, and it will be extremely difficult to regain your rankings.

Hi Hemant, Unfortunately for you, Moz's spam score is doing its job very well here - there is a lot of spam in your backlink profile. Looking at your list of referring domains, there are a lot of .ru, .in. .jp links etc which is strange for a US dentist, particularly when they're not in English. The anchor profile is a pretty good indication of spam here as well: no mention of the company name and in the top 20 most used anchors, only 1 of those isn't a blatant keyword. The other signal I noticed that's often an indication of spam is the fact that you went from 25 links to 411 in a couple of days. Basically, the best way to lower your spam score is to lower your spam Quality links should be relevant to what you do and from high quality websites.