A private practice owner dentist? An associate dentist? Dental school faculty dentist? Group practice partner dentist? Corporate affiliate dentist?
$200k loan? $350k? $500k?
5-year repayment plan? 10-year? 30-year? PAYE?
There are way too many variables.
Expect $120k-150k first ~2 years out as an associate, then $1k-2.5k/month in loan repayment (maybe more if you're really unlucky).
If you're not a business owner, loan repayment is after taxes, so you're left with anywhere from $54,000 - $93,000 per year.