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Who are we

Mark Hulsmans

Mark Hulsmans

Pediatric dentist
General practitioner

BIG: 69923915602

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Rob Aggenbach

Rob Aggenbach

Endodontics
General practitioner

BIG: 19919985702

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Tim Ottens

Tim Ottens

Cosmetic thk
Implantology
General practitioner

BIG: 69920503602

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Lisa

Lisa Besseling

Dentist

BIG: 29932400602

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Florence van Berkum

Dentist

BIG: 19937656602

Britt van den Tooren

Dentist

BIG: 89936928102

Tuyet

Tuyet Ha Luu

Dental hygienist

BIG: 29932891579

Saskia

Saskia Houwer

Dental hygienist

BIG: 89932736779

Eefje Oosterhaven

Dentist

BIG: 89938144002

Kim Hartkoorn

Dental hygienist

Liselotte van Westerveld

Periodontal Prevention Assistant

Avesta El Dlemi

Prevention assistant

Laetitia Graadt van Roggen

Dental hygienist

Oscar Schmedding

Periodontal Prevention Assistant

Anouk Hogenboom

Prevention assistant

Oude Rijn Tandartsen

Location Alphen aan den Rijn

Location Leiden

  • Monday to Friday
  • from 8:30 AM to 5:00 PM
  • Weekend
  • Closed

No long
waiting times

Free parking
next door

Easily accessible
by public transport

Many specialisms
under one roof

Opening hours Alphen aan den Rijn

  • Monday
  • Tuesday
  • Wednesday
  • Thursday
  • Friday
  • Weekend
  • 08:30 - 17:00
  • 08:30 - 17:00
  • 08:30 - 17:00
  • 08:30 - 17:00
  • 08:30 - 17:00
  • Closed

Opening hours Leiden

  • Monday
  • Tuesday
  • Wednesday
  • Thursday
  • Friday
  • Saturday
  • Sunday
  • 08:30 - 17:00
  • 08:30 - 17:00
  • 08:30 - 17:00
  • 08:30 - 17:00
  • 08:30 - 17:00
  • 10:00 - 15:00
  • Closed

Alphen aan den Rijn

Leiden

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© Old Rhine Dentists 2026

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Mark Hulsmans

Mark has been working as a dentist since 2018 and has subsequently specialized in pediatric dentistry and anxious patients. He also spent a long time as a lecturer at the university (ACTA) in the pediatric dentistry program. As a result, he treats patients with a state-of-the-art approach and the latest treatment techniques. The love he receives after a successful treatment is what makes him so fulfilling in his profession. 

Prevention is a top priority for Mark. He has a positive attitude and strives to help his patients achieve healthy, beautiful teeth that will help them function well for life. In his free time, he enjoys kitesurfing and exploring the world through travel. 

Rob Aggenbach

Rob has been a passionate, enthusiastic dentist with a passion for his profession since 2015. Besides being a true all-rounder professionally, he has also specialized in endodontics. He knows how to relieve your pain effectively, accurately, and quickly. This is all done with a healthy dose of humor!

Rob believes in lifelong learning. That's why he's constantly taking additional training and refresher courses. "I enjoy my job; I learn every day!"

Outside of work, Rob can be found playing guitar, drums or enjoying a round of golf. 

Tim Ottens

Tim Ottens graduated from the University of Groningen in 2015. After gaining more than seven years of valuable experience in a large specialist dental practice, starting a practice with two other passionate dentists was a logical next step.

Tim has completed various courses and training programs at home and abroad, deepening his knowledge of reconstructive and aesthetic dentistry and implantology. Using a digital treatment plan (known as a Digital Smile Design), he works efficiently to give you a lasting, radiant smile (or to restore it). His other passions outside of work include winter sports, travel, and good food.

Lisa Besseling

Lisa graduated from ACTA University in Amsterdam in 2022. She is an enthusiastic dentist with a passion and interest in all areas of dentistry.

She believes it's important to provide personalized care, ensuring each patient receives the most positive, personalized, and patient treatment possible. She's meticulous and always strives for the best results.

Lisa is eager to learn and believes continuing education is important. She regularly attends various courses at home and abroad.

In her spare time, Lisa enjoys sports, traveling, cooking and catering.

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