Ukrop Dental volunteer dentist Vasiliy Stoyan treats a soldier in Karlivka, Ukraine about 12km from the front line. Ukrop Dental is a program conceived by Igor Yaschenko that provides free dental care to soldiers, as well as underserved local populations, via an office and mobile clinics in embattled Eastern Ukraine.

Dental tools and a soldier's freshly removed tooth are seen in the Ukrop Dental clinic.

Ukrop Dental volunteer dentists Alla, center, and Vasiliy Stoyan, right, and founder Igor Yaschenko, left, work in their clinic in Karlivka, Ukraine.

Ukrop Dental founder Igor Yaschenko removes covers from his shoes outside one of the program's mobile clinics in Avdiivka, Ukraine.

Ukrop Dental volunteer dentist Alla works on soldier Pavel Yizik in Karlivka, Ukraine.

Soldiers talk amongst themselves while waiting to be treated in the foyer of the Ukrop Dental clinic.

Ukrop Dental founder Igor Yaschenko poses for a portrait inside his bedroom, which also serves as the studio for Trizub Radio, at the clinic.

A Ukrop Dental volunteer dentist chisels a gypsum model of a patient's teeth.

A smattering of bullet holes is seen on the outside of the Ukrop Dental clinic as a soldier receives treatment.

Ukrop Dental volunteer dentist Vasiliy Stoyan treats a soldier.

A soldier displays his gold teeth following his appointment at the Ukrop Dental clinic.

Volunteer dentist Alla talks with Ukrop Dental founder Igor Yaschenko. The mural on the kitchen wall is a pastoral scene that includes a Kalashnikov-style rifle leaning against a house.

Ukrop Dental volunteer dentist Vasiliy Stoyan watches videos on his phone while resting in his bed in between treating patients. Bunkbeds on the second floor of the clinic provide volunteers with places to sleep at night as well as in between shifts in the treatment room.

Ukrop Dental volunteer Alla steps outside for a cigarette break. Alla learned the next day that her husband, a soldier, had been wounded in action.

A sign memorializing a soldier who was killed in January is seen above a sign describing proper tooth brushing techniques in the Ukrop Dental clinic.

Ukrop Dental volunteer dentist Vasiliy Stoyan, left, and founder Igor Yaschenko, center look on as dentist Alla adds her handprint to a wall in the clinic's kitchen. Each dentist that volunteers in the clinic leaves their hand-print on the wall in blue and yellow (the colors of the Ukrainian flag) or black and red (nationalist colors that date to the Second World War and are used by the country's contemporary nationalist paramilitary, Right Sector).

Ukrop Dental volunteer dentist Vasiliy Stoyan treats a soldier.

Ukrop Dental founder Igor Yaschenko poses for a portrait inside his bedroom, which also serves as the studio for Trizub Radio.

Ukrop Dental volunteer dentist Alexander Kolomiyets demonstrates how he sleeps in his bed in a room where munitions, left, are stored in a building adjacent to his mobile clinic in Avdiivka, Ukraine.

Ukrop Dental founder Igor Yaschenko checks his phone in a storage room off the kitchen at his clinic. Each dentist that volunteers in the clinic leaves their hand-print on the wall in blue and yellow (the colors of the Ukrainian flag) or black and red (nationalist colors that date to the Second World War and are used by the country's contemporary nationalist paramilitary, Right Sector).

A cat sleeps in a dentist chair in the Ukrop Dental clinic.